diff --git a/Makefile b/Makefile
index 6b606da..83e5646 100644
--- a/Makefile
+++ b/Makefile
@@ -242,7 +242,7 @@
 CFLAGS += -DVSOCK
 endif
 
-CUNIT_INSTALLED := $(shell if (printf "$(pound)include <CUnit/Basic.h>\n void main(){CU_initialize_registry();}" | $(CC) -x c -lcunit - >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi)
+CUNIT_INSTALLED := $(shell if (printf "$(pound)include <CUnit/Basic.h>\n void main(){CU_initialize_registry();}" | $(CC) -x c - -lcunit >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi)
 export CUNIT_INSTALLED
 
 export CFLAGS