diff --git a/radio/src/targets/simu/simpgmspace.h b/radio/src/targets/simu/simpgmspace.h
index ea07a9885..b72e5681f 100644
--- a/radio/src/targets/simu/simpgmspace.h
+++ b/radio/src/targets/simu/simpgmspace.h
@@ -327,7 +327,10 @@ extern void rxPdcUsart( void (*pChProcess)(uint8_t x) );
 #define FE0     0
 
 #define ISR(x, ...)  void x()
+
+#if !defined(WIN32) && defined(__GNUC__)
 #define asm(...)
+#endif
 
 #if defined(CPUARM)
 extern uint32_t Master_frequency;