diff --git a/lib/ibutil.c b/lib/ibutil.c
index 4bccf90d..3b617028 100644
--- a/lib/ibutil.c
+++ b/lib/ibutil.c
@@ -99,7 +99,7 @@ int setup_global_board_descriptors(void)
        return retval;
 }
 
-static pthread_mutex_t config_lock = PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP;
+static pthread_mutex_t config_lock = PTHREAD_MUTEX_INITIALIZER;
 
 static void gpib_atfork_prepare(void)
 {