diff --git a/os/rt/ports/ARMCMx/cmsis_os/cmsis_os.h b/os/rt/ports/ARMCMx/cmsis_os/cmsis_os.h
index 23f12a0b6..12a37eeaa 100644
--- a/os/rt/ports/ARMCMx/cmsis_os/cmsis_os.h
+++ b/os/rt/ports/ARMCMx/cmsis_os/cmsis_os.h
@@ -502,7 +502,7 @@ static inline osStatus osThreadYield(void) {
  */
 static inline osPriority osThreadGetPriority(osThreadId thread_id) {
 
-  return thread_id->p_prio;
+  return (osPriority)(NORMALPRIO - thread_id->p_prio);
 }
 
 /**
diff --git a/readme.txt b/readme.txt
index acc7d8059..8fdd38c78 100644
--- a/readme.txt
+++ b/readme.txt
@@ -73,6 +73,8 @@
 *****************************************************************************
 
 *** 16.1.5 ***
+- HAL: Fixed CMSIS function osThreadGetPriority() does not return correct
+       priority (bug #752).
 - HAL: Fixed wrong conditional branches in _adc_isr_error_code (bug #751).
 - HAL: Fixed bug in STM32/ADCv3 (bug #750).
 - HAL: Fixed OPT settings and added board folder in STM32F4xx-USB_CDC demo