diff --git a/src/Makefile.am b/src/Makefile.am
index 4471220..b75a60d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,7 +1,13 @@
 include_HEADERS = jansson.h
 
 lib_LTLIBRARIES = libjansson.la
-libjansson_la_SOURCES = dump.c hashtable.h hashtable.c load.c value.c
+libjansson_la_SOURCES = \
+	dump.c \
+	hashtable.c \
+	hashtable.h \
+	load.c \
+	util.h \
+	value.c
 libjansson_la_LDFLAGS = -version-info 0:0:0
 
 AM_CFLAGS = -Wall -Wextra -std=c99
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..5bffa9b
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,6 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+#define max(a, b)  ((a) > (b) ? (a) : (b))
+
+#endif
diff --git a/src/value.c b/src/value.c
index ea539ff..998446c 100644
--- a/src/value.c
+++ b/src/value.c
@@ -4,8 +4,7 @@
 
 #include <jansson.h>
 #include "hashtable.h"
-
-#define max(a, b)  ((a) > (b) ? (a) : (b))
+#include "util.h"
 
 #define container_of(ptr_, type_, member_)  \
     ((type_ *)((char *)ptr_ - (size_t)&((type_ *)0)->member_))