diff --git a/src/network.c b/src/network.c
index 8f7a469..2a17ddf 100644
--- a/src/network.c
+++ b/src/network.c
@@ -5,7 +5,6 @@
 #include <openssl/crypto.h>
 
 #include <errno.h>
-#include <pthread.h>
 #include <string.h>
 #include <stdio.h>
 #include <unistd.h>
diff --git a/src/util.c b/src/util.c
index 914b30f..2b2445a 100644
--- a/src/util.c
+++ b/src/util.c
@@ -31,3 +31,25 @@ int64_t round_div(int64_t a, int64_t b)
 {
     return (a + (b / 2)) / b;
 }
+
+void PTHREAD_MUTEX_UNLOCK(pthread_mutex_t *x)
+{
+    int i;
+    i = pthread_mutex_unlock(x);
+    if (i) {
+        fprintf(stderr, "pthread_mutex_unlock failed, %d, %s\n", i,
+        strerror(i));
+        exit(EXIT_FAILURE);
+    }
+}
+
+void PTHREAD_MUTEX_LOCK(pthread_mutex_t *x)
+{
+    int i;
+    i = pthread_mutex_lock(x);
+    if (i) {
+        fprintf(stderr, "pthread_mutex_lock failed, %d, %s\n", i,
+        strerror(i));
+        exit(EXIT_FAILURE);
+    }
+}
diff --git a/src/util.h b/src/util.h
index 89cdb57..1b2543b 100644
--- a/src/util.h
+++ b/src/util.h
@@ -5,6 +5,7 @@
  * \brief utility functions
  */
 
+#include <pthread.h>
 #include <stdint.h>
 #include <stdlib.h>
 
@@ -20,30 +21,13 @@
 /**
  * \brief wrapper for pthread_mutex_lock()
  */
-#define PTHREAD_MUTEX_LOCK(x)\
-({\
-    int i;\
-    i = pthread_mutex_lock(x);\
-    if (i) { \
-        fprintf(stderr, "pthread_mutex_lock failed, %d, %s\n", i, \
-        strerror(i));\
-        exit(EXIT_FAILURE);\
-    }\
-})
+void PTHREAD_MUTEX_LOCK(pthread_mutex_t *x);
 
 /**
  * \brief wrapper for pthread_mutex_unlock()
  */
-#define PTHREAD_MUTEX_UNLOCK(x)\
-({\
-    int i;\
-    i = pthread_mutex_unlock(x);\
-    if (i) { \
-        fprintf(stderr, "pthread_mutex_unlock failed, %d, %s\n", i, \
-        strerror(i));\
-        exit(EXIT_FAILURE);\
-    }\
-})
+void PTHREAD_MUTEX_UNLOCK(pthread_mutex_t *x);
+
 
 /**
  * \brief append a path