diff --git a/regress/regress.c b/regress/regress.c
index 93972071..5f63e6aa 100644
--- a/regress/regress.c
+++ b/regress/regress.c
@@ -55,7 +55,7 @@ void tenth_last_column(void)
 	tcgetwincurpos(1, &wcp);
 	if ( wcp.wcp_col - ws.ws_col < 10 )
 		printf("\n");
-	printf("\e[%zuG", ws.ws_col - 10);
+	printf("\e[%zuG", (size_t) (ws.ws_col - 10));
 	fflush(stdout);
 }
 
diff --git a/sh/sh.c b/sh/sh.c
index 3ff1cc62..07e4f408 100644
--- a/sh/sh.c
+++ b/sh/sh.c
@@ -95,9 +95,9 @@ void update_env(void)
 	struct winsize ws;
 	if ( tcgetwinsize(0, &ws) == 0 )
 	{
-		snprintf(str, sizeof(str), "%zu", ws.ws_col);
+		snprintf(str, sizeof(str), "%zu", (size_t) ws.ws_col);
 		setenv("COLUMNS", str, 1);
-		snprintf(str, sizeof(str), "%zu", ws.ws_row);
+		snprintf(str, sizeof(str), "%zu", (size_t) ws.ws_row);
 		setenv("LINES", str, 1);
 	}
 }