diff --git a/testsuite/slurm_unit/common/bitstring-test.c b/testsuite/slurm_unit/common/bitstring-test.c
index 91bc673f43670786554b5ae080e99ec55f406ba9..40bf852302e31e51a8898875c39f51a9301756ff 100644
--- a/testsuite/slurm_unit/common/bitstring-test.c
+++ b/testsuite/slurm_unit/common/bitstring-test.c
@@ -1,6 +1,6 @@
 /* Test of src/bitstring.c 
  */
-
+#include <stdlib.h>
 #include <src/common/bitstring.h>
 #include <sys/time.h>
 #include <testsuite/dejagnu.h>