diff --git a/cc/coverage.go b/cc/coverage.go
index cc9a1ad..f885fcb 100644
--- a/cc/coverage.go
+++ b/cc/coverage.go
@@ -92,7 +92,7 @@
 			// flags that the module may use.
 			flags.Local.CFlags = append(flags.Local.CFlags, "-Wno-frame-larger-than=", "-O0")
 		} else if clangCoverage {
-			flags.Local.CommonFlags = append(flags.Local.CommonFlags, "-fprofile-instr-generate", "-fcoverage-mapping")
+			flags.Local.CommonFlags = append(flags.Local.CommonFlags, "-fprofile-instr-generate", "-fcoverage-mapping", "-Wno-pass-failed")
 		}
 	}