diff --git a/test/C/src/FileReader.lf b/test/C/src/FileReader.lf
index e802baf115..d1995358fa 100644
--- a/test/C/src/FileReader.lf
+++ b/test/C/src/FileReader.lf
@@ -6,7 +6,7 @@ reactor Source {
 
   reaction(startup) -> out {=
     char* file_path =
-      LF_SOURCE_DIRECTORY
+      "LF_SOURCE_DIRECTORY"
       LF_FILE_SEPARATOR "lib"
       LF_FILE_SEPARATOR "FileReader.txt";