diff --git a/build/platform-msvc.mk b/build/platform-msvc.mk
index 74a05881..f3d6460b 100644
--- a/build/platform-msvc.mk
+++ b/build/platform-msvc.mk
@@ -3,4 +3,7 @@ LDFLAGS += user32.lib
 CFLAGS_OPT += -MT
 CFLAGS_DEBUG += -MTd -Gm
 
+# Make sure a plain "make" without a target still builds "all"
+all:
+
 $(LIBPREFIX)$(PROJECT_NAME).$(SHAREDLIBSUFFIXVER): openh264.res