diff --git a/tests/examples/spectrum/demo-audiotest.c b/tests/examples/spectrum/demo-audiotest.c
index ed47278f1b..edb1d1dca4 100644
--- a/tests/examples/spectrum/demo-audiotest.c
+++ b/tests/examples/spectrum/demo-audiotest.c
@@ -21,6 +21,7 @@
 #include "config.h"
 #endif
 
+#include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <gst/gst.h>
diff --git a/tests/examples/spectrum/demo-osssrc.c b/tests/examples/spectrum/demo-osssrc.c
index 6419293a72..b71843e673 100644
--- a/tests/examples/spectrum/demo-osssrc.c
+++ b/tests/examples/spectrum/demo-osssrc.c
@@ -20,6 +20,8 @@
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
+
+#include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <gst/gst.h>