diff --git a/src/ccextractor.c b/src/ccextractor.c
index 5d2b9f78..b27fe172 100644
--- a/src/ccextractor.c
+++ b/src/ccextractor.c
@@ -182,7 +182,7 @@ int main(int argc, char *argv[])
 			strcpy (ctx->basefilename, ctx->basefilename_for_network);
 			break;
 	}		
-	for (c=ctx->basefilename+strlen (ctx->basefilename)-1; ctx->basefilename &&
+	for (c=ctx->basefilename+strlen (ctx->basefilename)-1; ctx->basefilename>=0 &&
 		*c!='.'; c--) {;} // Get last .
 	if (*c=='.')
 		*c=0;