diff --git a/stdio-common/test-vfprintf.c b/stdio-common/test-vfprintf.c
index 8483d8d..66e7d5c 100644
--- a/stdio-common/test-vfprintf.c
+++ b/stdio-common/test-vfprintf.c
@@ -25,6 +25,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <libc-internal.h>
 
 
 const char *locs[] =
diff --git a/stdio-common/tst-sprintf.c b/stdio-common/tst-sprintf.c
index ea3008b..d5284b9 100644
--- a/stdio-common/tst-sprintf.c
+++ b/stdio-common/tst-sprintf.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <locale.h>
 #include <string.h>
+#include <libc-internal.h>
 
 
 static int