diff --git a/lib/std/heap.zig b/lib/std/heap.zig
index 290b39b6242d4df787b7f6fe229b9cf7b4e5c8d8..b728d0da7e3342b61d9014572cfaa2d58ff7eb36 100644
--- a/lib/std/heap.zig
+++ b/lib/std/heap.zig
@@ -497,6 +497,7 @@ test raw_c_allocator {
 }
 
 test smp_allocator {
+    if (builtin.single_threaded) return;
     try testAllocator(smp_allocator);
     try testAllocatorAligned(smp_allocator);
     try testAllocatorLargeAlignment(smp_allocator);