diff --git a/lib/liboath/oath_impl.h b/lib/liboath/oath_impl.h
index 02ccfd9..4c9fda9 100644
--- a/lib/liboath/oath_impl.h
+++ b/lib/liboath/oath_impl.h
@@ -43,10 +43,14 @@
 /*
  * Use at end of switch which has no default case
  */
-#define COVERAGE_NO_DEFAULT_CASE \
+#if _BullseyeCoverage
+#define COVERAGE_NO_DEFAULT_CASE			\
 	COVERAGE_DISABLE				\
 	default:					\
 		(void)0;				\
 	COVERAGE_RESTORE
 
 #endif
+#else
+#define COVERAGE_NO_DEFAULT_CASE
+#endif