diff --git a/src/villas-convert.cpp b/src/villas-convert.cpp
index 084efbe7a..1f19c9c36 100644
--- a/src/villas-convert.cpp
+++ b/src/villas-convert.cpp
@@ -56,7 +56,6 @@ int main(int argc, char *argv[])
 
 	/* Parse optional command line arguments */
 	int c;
-	char *endptr;
 	while ((c = getopt(argc, argv, "Vhd:i:o:")) != -1) {
 		switch (c) {
 			case 'V':