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-rw-r--r--argp/argp-fmtstream.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/argp/argp-fmtstream.c b/argp/argp-fmtstream.c
index e5acda68e6..05e9e21f06 100644
--- a/argp/argp-fmtstream.c
+++ b/argp/argp-fmtstream.c
@@ -41,6 +41,7 @@
 #endif
 
 #if defined _LIBC && defined USE_IN_LIBIO
+# include <libio/libioP.h>
 # define __vsnprintf(s, l, f, a) _IO_vsnprintf (s, l, f, a)
 #endif