diff --git a/builder/frameworks/espidf.py b/builder/frameworks/espidf.py
index 47583a3..c2eb365 100644
--- a/builder/frameworks/espidf.py
+++ b/builder/frameworks/espidf.py
@@ -1853,7 +1853,7 @@ extra_cmake_args = [
 
 # This will add the linker flag for the map file
 extra_cmake_args.append(
-    f'-DCMAKE_EXE_LINKER_FLAGS=-Wl,-Map={os.path.join(BUILD_DIR, env.subst("$PROGNAME") + ".map")}'
+    f'-DCMAKE_EXE_LINKER_FLAGS=-Wl,-Map={fs.to_unix_path(os.path.join(BUILD_DIR, env.subst("$PROGNAME") + ".map"))}'
 )
 
 # Add any extra args from board config