diff --git a/lib-src/make-docfile.c b/lib-src/make-docfile.c
index 85bcc8bc89c..9470bd635f5 100644
--- a/lib-src/make-docfile.c
+++ b/lib-src/make-docfile.c
@@ -224,11 +224,7 @@ put_filename (char *filename)
 
   for (tmp = filename; *tmp; tmp++)
     {
-      /* Use separate variable to silence a Clang warning on macOS.
-         Clang takes offence of the additional set of parantheses
-         generated by the macro.  */
-      bool is_sep = IS_DIRECTORY_SEP (*tmp);
-      if (is_sep)
+      if (IS_DIRECTORY_SEP (*tmp))
 	filename = tmp + 1;
     }