diff --git a/README.md b/README.md
index 0ceb2f4..270cd8b 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ Supported Platforms
 Stackusage is primarily developed and tested on Linux, but basic
 functionality should work in macOS / OS X as well. Current version has been
 tested on:
-- macOS Big Sur 11.0
+- macOS Monterey 12.1
 - Ubuntu 20.04 LTS
 
 Limitation: On macOS / OS X this tool relies on code injection using
diff --git a/make.sh b/make.sh
index af0ac59..51aaee9 100755
--- a/make.sh
+++ b/make.sh
@@ -95,7 +95,7 @@ fi
 
 # tests
 if [[ "${TESTS}" == "1" ]]; then
-  cd build && ctest -C unit --output-on-failure && ctest -C perf --verbose && cd .. || exiterr "tests failed, exiting."
+  cd build && ctest --output-on-failure && cd .. || exiterr "tests failed, exiting."
 fi
 
 # doc
diff --git a/src/stackusage b/src/stackusage
index fd0db8d..a7f294c 100755
--- a/src/stackusage
+++ b/src/stackusage
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright (C) 2015-2021 Kristofer Berggren
+# Copyright (C) 2015-2022 Kristofer Berggren
 # All rights reserved.
 #
 # stackusage is distributed under the BSD 3-Clause license, see LICENSE for details.
@@ -43,9 +43,9 @@ showusage()
 
 showversion()
 {
-  echo "stackusage v1.15"
+  echo "stackusage v1.16"
   echo ""
-  echo "Copyright (C) 2015-2021 Kristofer Berggren"
+  echo "Copyright (C) 2015-2022 Kristofer Berggren"
   echo ""
   echo "stackusage is distributed under the BSD 3-Clause license."
   echo ""
@@ -182,7 +182,6 @@ while [ "${LIBPATHS[CNT]}" != "" ]; do
       SU_SIGNO="${SIGNO}"                   \
       LD_PRELOAD="${LIBPATH}"               \
       DYLD_INSERT_LIBRARIES="${LIBPATH}"    \
-      DYLD_FORCE_FLAT_NAMESPACE=1           \
       "${@:1}"
     else
       LLDBCMDPATH="${TMP}/lldb.cmd"
@@ -190,7 +189,6 @@ while [ "${LIBPATHS[CNT]}" != "" ]; do
       echo "env SU_SIGNO=\"${SIGNO}\""                  >> "${LLDBCMDPATH}"
       echo "env LD_PRELOAD=\"${LIBPATH}\""              >> "${LLDBCMDPATH}"
       echo "env DYLD_INSERT_LIBRARIES=\"${LIBPATH}\""   >> "${LLDBCMDPATH}"
-      echo "env DYLD_FORCE_FLAT_NAMESPACE=1"            >> "${LLDBCMDPATH}"
       echo "run ${@:2}"                                 >> "${LLDBCMDPATH}"
       lldb "${1}" -s "${LLDBCMDPATH}"
     fi
diff --git a/src/stackusage.1 b/src/stackusage.1
index cdd22f8..925aca5 100644
--- a/src/stackusage.1
+++ b/src/stackusage.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man.
-.TH STACKUSAGE "1" "December 2021" "stackusage v1.15" "User Commands"
+.TH STACKUSAGE "1" "January 2022" "stackusage v1.16" "User Commands"
 .SH NAME
 stackusage \- measure stack usage in applications
 .SH SYNOPSIS
@@ -57,6 +57,6 @@ Written by Kristofer Berggren
 .SH "REPORTING BUGS"
 Report bugs at https://github.com/d99kris/stackusage
 .SH COPYRIGHT
-Copyright \(co 2015\-2021 Kristofer Berggren
+Copyright \(co 2015\-2022 Kristofer Berggren
 .PP
 stackusage is distributed under the BSD 3\-Clause license.
diff --git a/src/sumain.c b/src/sumain.c
index 8023a93..6df2477 100644
--- a/src/sumain.c
+++ b/src/sumain.c
@@ -1,7 +1,7 @@
 /*
  * sumain.c
  *
- * Copyright (C) 2015-2018 Kristofer Berggren
+ * Copyright (C) 2015-2022 Kristofer Berggren
  * All rights reserved.
  * 
  * stackusage is distributed under the BSD 3-Clause license, see LICENSE for details.
@@ -50,6 +50,13 @@
 #define SU_LOG_WARN  SU_LOG("%s (pid %d): %s:%d warning\n", \
                             su_name, getpid(), __FUNCTION__, __LINE__)
 
+#if defined(__APPLE__)
+#define DYLD_INTERPOSE(_newfun, _orgfun) \
+__attribute__((used)) static struct{ const void *newfun; const void *orgfun; } _interpose_##_orgfun \
+__attribute__ ((section ("__DATA,__interpose"))) = { (const void *)(unsigned long)&_newfun, \
+                                                     (const void *)(unsigned long)&_orgfun }
+#endif
+
 
 /* ----------- Types --------------------------------------------- */
 typedef struct
@@ -168,20 +175,32 @@ void signal_handler(int num)
 }
 
 
+#if defined(__APPLE__)
+int pthread_create_wrap(pthread_t *thread, const pthread_attr_t *attr,
+                        void *(*start_routine) (void *), void *arg);
+
+int pthread_create_wrap(pthread_t *thread, const pthread_attr_t *attr,
+                        void *(*start_routine) (void *), void *arg)
+#else
 int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
                    void *(*start_routine) (void *), void *arg)
+#endif
 {
   int rv = -1;
   su_threadstart_t *tstart = NULL;
 
   if(real_pthread_create == NULL)
   {
+#if defined(__APPLE__)
+    real_pthread_create = pthread_create;
+#else
     /* Get function ptr to real pthread_create */
     real_pthread_create = dlsym(RTLD_NEXT, "pthread_create");
     if(real_pthread_create == NULL)
     {
       SU_LOG_ERR;
     }
+#endif
 
     /* Initialize thread key with callback at thread termination */
     pthread_key_create(&threadkey, su_thread_fini);
@@ -225,6 +244,9 @@ int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
 
   return rv;
 }
+#if defined(__APPLE__)
+DYLD_INTERPOSE(pthread_create_wrap, pthread_create);
+#endif
 
 
 /* ----------- Local Functions ----------------------------------- */