diff --git a/src/os_mac_conv.c b/src/os_mac_conv.c
index 9f19a80..56d8953 100644
--- a/src/os_mac_conv.c
+++ b/src/os_mac_conv.c
@@ -74,7 +74,7 @@
 	fprintf(stderr, "Encoding failed\n");
     /* When conversion failed, try excluding bytes from the end, helps when
      * there is an incomplete byte sequence.  Only do up to 6 bytes to avoid
-     * looping a long time when there really is something unconvertable. */
+     * looping a long time when there really is something unconvertible. */
     while (cfstr == NULL && unconvlenp != NULL && len > 1 && *unconvlenp < 6)
     {
 	--len;