diff --git a/configure.ac b/configure.ac
index 21404e6fcf..2de7d76f77 100644
--- a/configure.ac
+++ b/configure.ac
@@ -553,6 +553,14 @@ LIBS="$PTHREAD_LIBS $LIBS"
 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 CC="$PTHREAD_CC"
 
+AC_MSG_CHECKING([for PTHREAD_MUTEX_ADAPTIVE_NP])
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM([[#include <pthread.h>]],
+		   [[(void)pthread_mutexattr_settype(&(pthread_mutexattr_t){ NULL }, PTHREAD_MUTEX_ADAPTIVE_NP);]])],
+  [AC_MSG_RESULT([yes])
+   AC_DEFINE([HAVE_PTHREAD_MUTEX_ADAPTIVE_NP], [1], [Define to 1 if PTHREAD_MUTEX_ADAPTIVE_NP is available])],
+  [AC_MSG_RESULT([no])])
+
 AC_CHECK_FUNCS([pthread_attr_getstacksize pthread_attr_setstacksize pthread_barrier_init pthread_spin_init])
 
 AC_CHECK_HEADERS([sched.h])
diff --git a/lib/isc/mutex.c b/lib/isc/mutex.c
index 67815eb7e9..e31ba1339c 100644
--- a/lib/isc/mutex.c
+++ b/lib/isc/mutex.c
@@ -33,15 +33,14 @@ static isc_once_t init_once = ISC_ONCE_INIT;
 static void
 mutex_initialize(void) {
 	RUNTIME_CHECK(pthread_mutexattr_init(&isc__mutex_init_attr) == 0);
-#if ISC_MUTEX_ERROR_CHECK && defined(PTHREAD_MUTEX_ERRORCHECK_NP)
+#if ISC_MUTEX_ERROR_CHECK
 	RUNTIME_CHECK(pthread_mutexattr_settype(&isc__mutex_init_attr,
-						PTHREAD_MUTEX_ERRORCHECK_NP) ==
-		      0);
-#elif defined(PTHREAD_MUTEX_ADAPTIVE_NP)
+						PTHREAD_MUTEX_ERRORCHECK) == 0);
+#elif HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
 	RUNTIME_CHECK(pthread_mutexattr_settype(&isc__mutex_init_attr,
 						PTHREAD_MUTEX_ADAPTIVE_NP) ==
 		      0);
-#endif /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
+#endif
 }
 
 void