diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index f860f7d891..f1e262012e 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -1135,9 +1135,6 @@ pub const panic: type = p: {
     break :p std.debug.FullPanic(std.debug.defaultPanic);
 };
 
-/// To be deleted after zig1.wasm is updated.
-pub const Panic = panic;
-
 pub noinline fn returnError() void {
     @branchHint(.unlikely);
     @setRuntimeSafety(false);
diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 7e68f16ee8..8134194380 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -134,9 +134,6 @@ pub fn FullPanic(comptime panicFn: fn ([]const u8, ?usize) noreturn) type {
             @branchHint(.cold);
             call("'noreturn' function returned", @returnAddress());
         }
-
-        /// To be deleted after zig1.wasm update.
-        pub const messages = simple_panic.messages;
     };
 }
 
diff --git a/lib/std/debug/no_panic.zig b/lib/std/debug/no_panic.zig
index 690453b62a..1ffae2027b 100644
--- a/lib/std/debug/no_panic.zig
+++ b/lib/std/debug/no_panic.zig
@@ -134,27 +134,3 @@ pub fn noreturnReturned() noreturn {
     @branchHint(.cold);
     @trap();
 }
-
-/// To be deleted after zig1.wasm update.
-pub const messages = struct {
-    pub const reached_unreachable = "";
-    pub const unwrap_null = "";
-    pub const cast_to_null = "";
-    pub const incorrect_alignment = "";
-    pub const invalid_error_code = "";
-    pub const cast_truncated_data = "";
-    pub const negative_to_unsigned = "";
-    pub const integer_overflow = "";
-    pub const shl_overflow = "";
-    pub const shr_overflow = "";
-    pub const divide_by_zero = "";
-    pub const exact_division_remainder = "";
-    pub const integer_part_out_of_bounds = "";
-    pub const corrupt_switch = "";
-    pub const shift_rhs_too_big = "";
-    pub const invalid_enum_value = "";
-    pub const for_len_mismatch = "";
-    pub const memcpy_len_mismatch = "";
-    pub const memcpy_alias = "";
-    pub const noreturn_returned = "";
-};
diff --git a/lib/std/debug/simple_panic.zig b/lib/std/debug/simple_panic.zig
index aeeba5b1d2..f2c8a0574b 100644
--- a/lib/std/debug/simple_panic.zig
+++ b/lib/std/debug/simple_panic.zig
@@ -126,27 +126,3 @@ pub fn memcpyAlias() noreturn {
 pub fn noreturnReturned() noreturn {
     call("'noreturn' function returned", null);
 }
-
-/// To be deleted after zig1.wasm update.
-pub const messages = struct {
-    pub const reached_unreachable = "reached unreachable code";
-    pub const unwrap_null = "attempt to use null value";
-    pub const cast_to_null = "cast causes pointer to be null";
-    pub const incorrect_alignment = "incorrect alignment";
-    pub const invalid_error_code = "invalid error code";
-    pub const cast_truncated_data = "integer cast truncated bits";
-    pub const negative_to_unsigned = "attempt to cast negative value to unsigned integer";
-    pub const integer_overflow = "integer overflow";
-    pub const shl_overflow = "left shift overflowed bits";
-    pub const shr_overflow = "right shift overflowed bits";
-    pub const divide_by_zero = "division by zero";
-    pub const exact_division_remainder = "exact division produced remainder";
-    pub const integer_part_out_of_bounds = "integer part of floating point value out of bounds";
-    pub const corrupt_switch = "switch on corrupt value";
-    pub const shift_rhs_too_big = "shift amount is greater than the type size";
-    pub const invalid_enum_value = "invalid enum value";
-    pub const for_len_mismatch = "for loop over objects with non-equal lengths";
-    pub const memcpy_len_mismatch = "@memcpy arguments have non-equal lengths";
-    pub const memcpy_alias = "@memcpy arguments alias";
-    pub const noreturn_returned = "'noreturn' function returned";
-};