diff --git a/src/cmd/5l/list.c b/src/cmd/5l/list.c
index a051774b414..7502a3b8186 100644
--- a/src/cmd/5l/list.c
+++ b/src/cmd/5l/list.c
@@ -473,7 +473,7 @@ Oconv(Fmt *fp)
 void
 diag(char *fmt, ...)
 {
-	char buf[STRINGSZ], *tn, *sep;
+	char buf[1024], *tn, *sep;
 	va_list arg;
 
 	tn = "";
diff --git a/src/cmd/6l/list.c b/src/cmd/6l/list.c
index f39efa2e83c..05b23049a0d 100644
--- a/src/cmd/6l/list.c
+++ b/src/cmd/6l/list.c
@@ -423,7 +423,7 @@ Iconv(Fmt *fp)
 void
 diag(char *fmt, ...)
 {
-	char buf[STRINGSZ], *tn, *sep;
+	char buf[1024], *tn, *sep;
 	va_list arg;
 
 	tn = "";
diff --git a/src/cmd/8l/list.c b/src/cmd/8l/list.c
index 0b544fbce00..e2a2ec5edc7 100644
--- a/src/cmd/8l/list.c
+++ b/src/cmd/8l/list.c
@@ -356,7 +356,7 @@ Iconv(Fmt *fp)
 void
 diag(char *fmt, ...)
 {
-	char buf[STRINGSZ], *tn, *sep;
+	char buf[1024], *tn, *sep;
 	va_list arg;
 
 	tn = "";