diff --git a/src/includes/rc-misc.h b/src/includes/rc-misc.h
index 4ba0f839..1294ed28 100644
--- a/src/includes/rc-misc.h
+++ b/src/includes/rc-misc.h
@@ -43,6 +43,8 @@
 
 #ifndef PREFIX
 #  define PREFIX		""
+#else
+#  define HAVE_PREFIX
 #endif
 
 #define RC_LEVEL_BOOT           "boot"
diff --git a/src/librc/librc.c b/src/librc/librc.c
index 5525f2f3..d292e856 100644
--- a/src/librc/librc.c
+++ b/src/librc/librc.c
@@ -186,7 +186,7 @@ static bool file_regex (const char *file, const char *regex)
 
 const char *rc_sys (void)
 {
-#ifdef PREFIX
+#ifdef HAVE_PREFIX
 	return (RC_SYS_PREFIX);
 #else