diff --git a/GNUmakefile b/GNUmakefile
index dc01caaf..bb4ad2cb 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -449,7 +449,7 @@ $(SODIUM_OBJS): CFLAGS += \
 	-Wno-attributes \
 	-Ideps/libsodium/builds/msvc \
 	-Ideps/libsodium/src/libsodium/include/sodium
-$(SODIUM_OBJS_unix): CFLAGS += \
+$(filter-out $(BUILD_DIR)/win%,$(SODIUM_OBJS)): CFLAGS += \
 	-DHAVE_ALLOCA_H
 
 SQLITE_SOURCES := deps/sqlite/sqlite3.c