diff --git a/gcc/testsuite/gfortran.dg/c-interop/cf-descriptor-5-c.c b/gcc/testsuite/gfortran.dg/c-interop/cf-descriptor-5-c.c
index 0cd92e78900..12464b55512 100644
--- a/gcc/testsuite/gfortran.dg/c-interop/cf-descriptor-5-c.c
+++ b/gcc/testsuite/gfortran.dg/c-interop/cf-descriptor-5-c.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <alloca.h>
 
 #include <ISO_Fortran_binding.h>
 #include "dump-descriptors.h"