diff --git a/GNUmakefile b/GNUmakefile
index bb4ad2cb..a6b1449c 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -449,8 +449,10 @@ $(SODIUM_OBJS): CFLAGS += \
 	-Wno-attributes \
 	-Ideps/libsodium/builds/msvc \
 	-Ideps/libsodium/src/libsodium/include/sodium
+ifneq ($(UNAME_S),OpenBSD)
 $(filter-out $(BUILD_DIR)/win%,$(SODIUM_OBJS)): CFLAGS += \
 	-DHAVE_ALLOCA_H
+endif
 
 SQLITE_SOURCES := deps/sqlite/sqlite3.c
 SQLITE_OBJS := $(call get_objs,SQLITE_SOURCES)