diff --git a/src/test/ui/asm/srcloc.rs b/src/test/ui/asm/srcloc.rs
index 1477e3dd5665..7262064e7bbe 100644
--- a/src/test/ui/asm/srcloc.rs
+++ b/src/test/ui/asm/srcloc.rs
@@ -1,7 +1,7 @@
 // no-system-llvm
 // only-x86_64
 // build-fail
-
+// compile-flags: -Ccodegen-units=1
 #![feature(asm)]
 
 // Checks that inline asm errors are mapped to the correct line in the source code.