diff --git a/lib/std/array_hash_map.zig b/lib/std/array_hash_map.zig
index 31860963af..304c98a2a9 100644
--- a/lib/std/array_hash_map.zig
+++ b/lib/std/array_hash_map.zig
@@ -798,7 +798,7 @@ pub fn ArrayHashMapUnmanaged(
             allocator: Allocator,
             additional_capacity: usize,
         ) !void {
-            if (@sizeOf(ByIndexContext) != 0)
+            if (@sizeOf(Context) != 0)
                 @compileError("Cannot infer context " ++ @typeName(Context) ++ ", call ensureTotalCapacityContext instead.");
             return self.ensureUnusedCapacityContext(allocator, additional_capacity, undefined);
         }
diff --git a/lib/std/hash_map.zig b/lib/std/hash_map.zig
index 96df243f6e..eb24ef591b 100644
--- a/lib/std/hash_map.zig
+++ b/lib/std/hash_map.zig
@@ -913,6 +913,8 @@ pub fn HashMapUnmanaged(
         }
 
         pub fn ensureUnusedCapacity(self: *Self, allocator: Allocator, additional_size: Size) Allocator.Error!void {
+            if (@sizeOf(Context) != 0)
+                @compileError("Cannot infer context " ++ @typeName(Context) ++ ", call ensureUnusedCapacityContext instead.");
             return ensureUnusedCapacityContext(self, allocator, additional_size, undefined);
         }
         pub fn ensureUnusedCapacityContext(self: *Self, allocator: Allocator, additional_size: Size, ctx: Context) Allocator.Error!void {