diff --git a/spa/plugins/audioconvert/spa-resample.c b/spa/plugins/audioconvert/spa-resample.c
index 33e06c72f..2cb0e3240 100644
--- a/spa/plugins/audioconvert/spa-resample.c
+++ b/spa/plugins/audioconvert/spa-resample.c
@@ -218,7 +218,7 @@ static int do_conversion(struct data *d)
 
 int main(int argc, char *argv[])
 {
-	char c;
+	int c;
 	int longopt_index = 0, ret;
 	struct data data;