diff --git a/src/mod/event_handlers/mod_radius_cdr/Makefile b/src/mod/event_handlers/mod_radius_cdr/Makefile
index acec93a744..63542dff47 100644
--- a/src/mod/event_handlers/mod_radius_cdr/Makefile
+++ b/src/mod/event_handlers/mod_radius_cdr/Makefile
@@ -20,7 +20,7 @@ $(RADCLIENT_BUILDDIR)/Makefile: $(RADCLIENT_DIR)
 	$(TOUCH_TARGET)
 
 $(RADCLIENT_LA): $(RADCLIENT_BUILDDIR)/Makefile
-	cd $(RADCLIENT_BUILDDIR) && CFLAGS=$(CFLAGS) $(MAKE)
+	cd $(RADCLIENT_BUILDDIR) && CFLAGS="$(CFLAGS)" $(MAKE)
 	$(TOUCH_TARGET)