diff --git a/include/Makefile.am b/include/Makefile.am
index 84fe3a6c..9f978905 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -6,4 +6,5 @@ dist_noinst_HEADERS = \
 	rpmatch.h \
 	signals.h \
 	strutils.h \
+	tests.h \
 	xalloc.h
diff --git a/include/tests.h b/include/tests.h
index 1774f52d..324cc225 100644
--- a/include/tests.h
+++ b/include/tests.h
@@ -2,6 +2,8 @@
 #ifndef PROCPS_NG_TESTS_H
 #define PROCPS_NG_TESTS_H
 
+#include <stdio.h>
+
 typedef int (*TestFunction)(void *data);
 
 char *testname;