diff --git a/src/Sema.zig b/src/Sema.zig
index 3bd2a31bc79d3877d1374171bed8225273bb4ff1..a960980eec00ed4a5af9d8b6ce2e35c42c0f5dee 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -29385,7 +29385,18 @@ pub fn coerceInMemoryAllowed(
         if (dest_ty.structFieldCount(zcu) != src_ty.structFieldCount(zcu)) break :tuple;
         const field_count = dest_ty.structFieldCount(zcu);
         for (0..field_count) |field_idx| {
-            if (dest_ty.structFieldIsComptime(field_idx, zcu) != src_ty.structFieldIsComptime(field_idx, zcu)) break :tuple;
+            const dest_is_comptime = dest_ty.structFieldIsComptime(field_idx, zcu);
+            const src_is_comptime = src_ty.structFieldIsComptime(field_idx, zcu);
+            if (dest_is_comptime != src_is_comptime) {
+                break :tuple;
+            }
+            if (dest_is_comptime) {
+                const dest_comptime_field_val = dest_ty.structFieldDefaultValue(field_idx, zcu).?;
+                const src_comptime_field_val = src_ty.structFieldDefaultValue(field_idx, zcu).?;
+                if (dest_comptime_field_val.ip_index != src_comptime_field_val.ip_index) {
+                    break :tuple;
+                }
+            }
             const dest_field_ty = dest_ty.fieldType(field_idx, zcu);
             const src_field_ty = src_ty.fieldType(field_idx, zcu);
             const field = try sema.coerceInMemoryAllowed(block, dest_field_ty, src_field_ty, dest_is_mut, target, dest_src, src_src, null);
diff --git a/test/cases/compile_errors/coerce_tuple_incompatible_defaults.zig b/test/cases/compile_errors/coerce_tuple_incompatible_defaults.zig
new file mode 100644
index 0000000000000000000000000000000000000000..c46714405a33bdf838179a7167053d68de819e8c
--- /dev/null
+++ b/test/cases/compile_errors/coerce_tuple_incompatible_defaults.zig
@@ -0,0 +1,10 @@
+comptime {
+    const one = .{@as(u32, 1)};
+    const two = .{@as(u32, 2)};
+    const coerced: @TypeOf(one) = two;
+    _ = coerced;
+}
+
+// error
+//
+// :4:35: error: value stored in comptime field does not match the default value of the field