diff --git a/src/gui_w48.c b/src/gui_w48.c
index ef1e071..f417c72 100644
--- a/src/gui_w48.c
+++ b/src/gui_w48.c
@@ -3612,7 +3612,7 @@
 	    {
 		/* Backslashes are only special when followed by a double
 		 * quote. */
-		i = strspn(p, "\\");
+		i = (int)strspn(p, "\\");
 		if (p[i] == '"')
 		{
 		    /* Halve the number of backslashes. */