diff --git a/src/platforms/common/blackpill-f4/Makefile.inc b/src/platforms/common/blackpill-f4/Makefile.inc
index c3717a5bfbf..044079a5374 100644
--- a/src/platforms/common/blackpill-f4/Makefile.inc
+++ b/src/platforms/common/blackpill-f4/Makefile.inc
@@ -58,7 +58,7 @@ VPATH +=                          \
 SRC +=               \
 	blackpill-f4.c   \
 	traceswodecode.c \
-	traceswo.c       \
+	traceswoasync.c  \
 	serialno.c       \
 	timing.c         \
 	timing_stm32.c
diff --git a/src/platforms/common/blackpill-f4/blackpill-f4.h b/src/platforms/common/blackpill-f4/blackpill-f4.h
index 76649974309..6fbb68b172c 100644
--- a/src/platforms/common/blackpill-f4/blackpill-f4.h
+++ b/src/platforms/common/blackpill-f4/blackpill-f4.h
@@ -34,7 +34,7 @@
 
 #define PLATFORM_HAS_TRACESWO
 #define NUM_TRACE_PACKETS 256U /* 16K buffer */
-#define TRACESWO_PROTOCOL 1U   /* 1 = RZ/Manchester, 2 = NRZ/async/uart */
+#define TRACESWO_PROTOCOL 2U   /* 1 = RZ/Manchester, 2 = NRZ/async/uart */
 
 #if ENABLE_DEBUG == 1
 #define PLATFORM_HAS_DEBUG
diff --git a/src/platforms/common/blackpill-f4/meson.build b/src/platforms/common/blackpill-f4/meson.build
index 387cd8e5142..399ae8ea584 100644
--- a/src/platforms/common/blackpill-f4/meson.build
+++ b/src/platforms/common/blackpill-f4/meson.build
@@ -79,7 +79,7 @@ probe_host = declare_dependency(
 	sources: probe_blackpill_sources,
 	compile_args: probe_blackpill_args,
 	link_args: probe_blackpill_common_link_args + probe_blackpill_link_args,
-	dependencies: [platform_common, platform_stm32f4, fixme_platform_stm32_traceswo],
+	dependencies: [platform_common, platform_stm32f4, fixme_platform_stm32_traceswoasync],
 )
 
 probe_bootloader = declare_dependency(