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-rw-r--r--testsuite/tests/concurrent/should_run/conc059_c.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/testsuite/tests/concurrent/should_run/conc059_c.c b/testsuite/tests/concurrent/should_run/conc059_c.c
index 19493aee3f..f03615063f 100644
--- a/testsuite/tests/concurrent/should_run/conc059_c.c
+++ b/testsuite/tests/concurrent/should_run/conc059_c.c
@@ -1,6 +1,7 @@
#include "HsFFI.h"
#include "conc059_stub.h"
#include <unistd.h>
+#include <stdlib.h>
#include <stdio.h>
#if mingw32_HOST_OS
#include <windows.h>