diff --git a/test/behavior/align.zig b/test/behavior/align.zig
index 162c798758..901ea3697a 100644
--- a/test/behavior/align.zig
+++ b/test/behavior/align.zig
@@ -551,7 +551,11 @@ test "align(N) on functions" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO this is not supported on MSVC
+
+    // This is not supported on MSVC
+    if (builtin.zig_backend == .stage2_c and builtin.os.tag == .windows) {
+        return error.SkipZigTest;
+    }
 
     // function alignment is a compile error on wasm32/wasm64
     if (native_arch == .wasm32 or native_arch == .wasm64) return error.SkipZigTest;
diff --git a/test/behavior/asm.zig b/test/behavior/asm.zig
index f041963494..e9a01226b1 100644
--- a/test/behavior/asm.zig
+++ b/test/behavior/asm.zig
@@ -23,7 +23,6 @@ test "module level assembly" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
 
     if (is_x86_64_linux) {
         try expect(this_is_my_alias() == 1234);
@@ -36,7 +35,6 @@ test "output constraint modifiers" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
 
     // This is only testing compilation.
     var a: u32 = 3;
@@ -58,7 +56,6 @@ test "alternative constraints" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
 
     // Make sure we allow commas as a separator for alternative constraints.
     var a: u32 = 3;
@@ -75,7 +72,6 @@ test "sized integer/float in asm input" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
 
     asm volatile (""
         :
@@ -125,7 +121,6 @@ test "struct/array/union types as input values" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
 
     asm volatile (""
         :
diff --git a/test/behavior/int_comparison_elision.zig b/test/behavior/int_comparison_elision.zig
index 5e13e00e83..ea26f02b7e 100644
--- a/test/behavior/int_comparison_elision.zig
+++ b/test/behavior/int_comparison_elision.zig
@@ -13,7 +13,6 @@ test "int comparison elision" {
 
     // TODO: support int types > 128 bits wide in other backends
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
diff --git a/test/behavior/lower_strlit_to_vector.zig b/test/behavior/lower_strlit_to_vector.zig
index adbca8f0df..427379636e 100644
--- a/test/behavior/lower_strlit_to_vector.zig
+++ b/test/behavior/lower_strlit_to_vector.zig
@@ -7,7 +7,6 @@ test "strlit to vector" {
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
 
     const strlit = "0123456789abcdef0123456789ABCDEF";
     const vec_from_strlit: @Vector(32, u8) = strlit.*;
diff --git a/test/behavior/math.zig b/test/behavior/math.zig
index 8ab8614605..54263e1daf 100644
--- a/test/behavior/math.zig
+++ b/test/behavior/math.zig
@@ -1463,7 +1463,6 @@ test "vector integer addition" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
 
     const S = struct {
diff --git a/test/behavior/struct.zig b/test/behavior/struct.zig
index 8a01d68587..348e269682 100644
--- a/test/behavior/struct.zig
+++ b/test/behavior/struct.zig
@@ -1330,7 +1330,6 @@ test "struct field init value is size of the struct" {
 }
 
 test "under-aligned struct field" {
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
diff --git a/test/behavior/vector.zig b/test/behavior/vector.zig
index e983e0cfb0..191c7bf7eb 100644
--- a/test/behavior/vector.zig
+++ b/test/behavior/vector.zig
@@ -75,7 +75,6 @@ test "vector int operators" {
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
 
     const S = struct {
@@ -178,7 +177,6 @@ test "tuple to vector" {
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
 
     if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .aarch64) {
@@ -943,7 +941,6 @@ test "multiplication-assignment operator with an array operand" {
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
 
     const S = struct {
@@ -1247,7 +1244,6 @@ test "array operands to shuffle are coerced to vectors" {
 test "load packed vector element" {
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
@@ -1260,7 +1256,6 @@ test "load packed vector element" {
 test "store packed vector element" {
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
-    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO