diff --git a/lib/util/setgroups.c b/lib/util/setgroups.c
index 7298fcc04..83e0c4a9a 100644
--- a/lib/util/setgroups.c
+++ b/lib/util/setgroups.c
@@ -50,7 +50,7 @@ sudo_setgroups_v1(int ngids, const GETGROUPS_T *gids)
 	if (maxgids == -1)
 	    maxgids = NGROUPS_MAX;
 	if (ngids > maxgids)
-	    ret = setgroups(maxgids, (GETGROUPS_T *)gids);
+	    ret = setgroups((int)maxgids, (GETGROUPS_T *)gids);
     }
     debug_return_int(ret);
 }
diff --git a/plugins/sudoers/sudo_printf.c b/plugins/sudoers/sudo_printf.c
index f5ca60231..cb6bf47b8 100644
--- a/plugins/sudoers/sudo_printf.c
+++ b/plugins/sudoers/sudo_printf.c
@@ -69,7 +69,7 @@ sudo_printf_int(int msg_type, const char * restrict fmt, ...)
 	    va_end(ap);
 	}
 	if (len != -1) {
-	    if (fwrite(buf, 1, len, ttyfp ? ttyfp : fp) == 0)
+	    if (fwrite(buf, 1, (size_t)len, ttyfp ? ttyfp : fp) == 0)
 		len = -1;
 	    if (buf != sbuf)
 		free(buf);
diff --git a/src/conversation.c b/src/conversation.c
index ea2469ff3..9cc340c4d 100644
--- a/src/conversation.c
+++ b/src/conversation.c
@@ -219,7 +219,7 @@ sudo_conversation_printf(int msg_type, const char * restrict fmt, ...)
             va_end(ap);
         }
         if (len != -1) {
-            if (fwrite(buf, 1, len, ttyfp ? ttyfp : fp) == 0)
+            if (fwrite(buf, 1, (size_t)len, ttyfp ? ttyfp : fp) == 0)
                 len = -1;
             if (buf != sbuf)
                 free(buf);