diff --git a/Marlin/src/HAL/HAL_STM32F1/HAL.h b/Marlin/src/HAL/HAL_STM32F1/HAL.h
index a0a9a26de..f538e2760 100644
--- a/Marlin/src/HAL/HAL_STM32F1/HAL.h
+++ b/Marlin/src/HAL/HAL_STM32F1/HAL.h
@@ -121,7 +121,7 @@ void HAL_init();
 
 #define CRITICAL_SECTION_START  uint32_t primask = __get_primask(); (void)__iCliRetVal()
 #define CRITICAL_SECTION_END    if (!primask) (void)__iSeiRetVal()
-#define ISRS_ENABLED() (!__get_primask)
+#define ISRS_ENABLED() (!__get_primask())
 #define ENABLE_ISRS()  ((void)__iSeiRetVal())
 #define DISABLE_ISRS() ((void)__iCliRetVal())