diff --git a/src/sourceterms.c b/src/sourceterms.c
index 3615fb554ec24644af87702dc29dec7e1a761fca..2a5f326688b52b0e4abfde8dca823d765e0e8a5e 100644
--- a/src/sourceterms.c
+++ b/src/sourceterms.c
@@ -51,7 +51,7 @@ void sourceterms_print(struct sourceterms* source) {
 #ifdef SOURCETERMS_NONE
   error(" no sourceterms defined yet you ran with -F");
 #ifdef SOURCETERMS_SN_FEEDBACK
-#error can't have sourceterms when defined SOURCETERMS_NONE
+#error "can't have sourceterms when defined SOURCETERMS_NONE"
 #endif
 #endif
 #ifdef SOURCETERMS_SN_FEEDBACK