diff --git a/src/spellfile.c b/src/spellfile.c
index d3351ef..24df042 100644
--- a/src/spellfile.c
+++ b/src/spellfile.c
@@ -2890,7 +2890,7 @@
 		     || is_aff_rule(items, itemcnt, "REPSAL", 2))
 	    {
 		// Ignore REP/REPSAL count
-		if (!isdigit(*items[1]))
+		if (!SAFE_isdigit(*items[1]))
 		    smsg(_("Expected REP(SAL) count in %s line %d"),
 								 fname, lnum);
 	    }
@@ -2925,7 +2925,7 @@
 		{
 		    // First line contains the count.
 		    found_map = TRUE;
-		    if (!isdigit(*items[1]))
+		    if (!SAFE_isdigit(*items[1]))
 			smsg(_("Expected MAP count in %s line %d"),
 								 fname, lnum);
 		}