diff --git a/pidof.c b/pidof.c
index 7fdf27a..2166265 100644
--- a/pidof.c
+++ b/pidof.c
@@ -300,7 +300,7 @@ int main (int argc, char **argv)
 		{"check-root", no_argument, NULL, 'c'},
 		{"single-shot", no_argument, NULL, 's'},
 		{"omit-pid", required_argument, NULL, 'o'},
-		{"separator", required_argument, NULL, 's'},
+		{"separator", required_argument, NULL, 'S'},
 		{"with-workers", no_argument, NULL, 'w'},
 		{"help", no_argument, NULL, 'h'},
 		{"version", no_argument, NULL, 'V'},