diff --git a/configure b/configure
index a8ea55a6e4..285d4cc58d 100755
--- a/configure
+++ b/configure
@@ -1000,7 +1000,9 @@ fi
 ##########################################
 # iovec probe
 cat > $TMPC <<EOF
+#include <sys/types.h>
 #include <sys/uio.h>
+#include <unistd.h>
 int main(void) { struct iovec iov; return 0; }
 EOF
 iovec=no