diff --git a/src/image.c b/src/image.c
index 3d761bd48be..b77c12b4cbc 100644
--- a/src/image.c
+++ b/src/image.c
@@ -6249,9 +6249,7 @@ static const char xpm_color_key_strings[][4] = {"s", "m", "g4", "g", "c"};
 static int
 xpm_str_to_color_key (const char *s)
 {
-  int i;
-
-  for (i = 0; i < ARRAYELTS (xpm_color_key_strings); i++)
+  for (int i = 0; i < ARRAYELTS (xpm_color_key_strings); i++)
     if (strcmp (xpm_color_key_strings[i], s) == 0)
       return i;
   return -1;