diff --git a/libc/stdio/fmt.c b/libc/stdio/fmt.c
index 6e1492252..5e05d3ca1 100644
--- a/libc/stdio/fmt.c
+++ b/libc/stdio/fmt.c
@@ -78,7 +78,7 @@
 #define FLAGS_ISSIGNED  0x40
 #define FLAGS_NOQUOTE   0x80
 #define FLAGS_REPR      0x100
-#define FLAGS_QUOTE     FLAGS_SPACE
+#define FLAGS_QUOTE     0x200
 #define FLAGS_GROUPING  FLAGS_NOQUOTE
 
 #define __FMT_PUT(C)              \
diff --git a/test/libc/stdio/snprintf_test.c b/test/libc/stdio/snprintf_test.c
index e3cea6fcb..1dbbf3a07 100644
--- a/test/libc/stdio/snprintf_test.c
+++ b/test/libc/stdio/snprintf_test.c
@@ -250,3 +250,10 @@ TEST(snprintf, testAConversionSpecifier) {
   ASSERT_STREQ("0x1.8p+4", buf);
 }
 */
+
+TEST(snprintf, apostropheFlag) {
+  char buf[20];
+  int i = snprintf(buf, sizeof(buf), "%'d", 1000000);
+  ASSERT_EQ(7, i);
+  ASSERT_STREQ("1000000", buf);
+}