diff --git a/src/makefrontend.cpp b/src/makefrontend.cpp
index 326faf1..a330827 100644
--- a/src/makefrontend.cpp
+++ b/src/makefrontend.cpp
@@ -33,10 +33,10 @@
 #define PATH_ELEM "[a-zA-Z0-9_\\.\\-]+"
 
 #define RE_FILE_LINE \
-	"((?:\\/)?(?:"PATH_ELEM"\\/)*"PATH_ELEM"):([0-9]+)(:[0-9]+)?: (.*)"
+	"((?:\\/)?(?:" PATH_ELEM "\\/)*" PATH_ELEM "):([0-9]+)(:[0-9]+)?: (.*)"
 #define RE_ENTER_DIR \
 	"Entering directory " \
-	"\\`((\\/)?("PATH_ELEM"\\/)*"PATH_ELEM")"
+	"\\`((\\/)?(" PATH_ELEM "\\/)*" PATH_ELEM ")"
 #define RE_EXIT_DIR "Leaving directory"
 
 /**