diff --git a/Makefile b/Makefile
index 36e77e4..0f95cba 100644
--- a/Makefile
+++ b/Makefile
@@ -11,5 +11,5 @@ dist-no-7z: all
 	@cp -r dist/* out/
 
 dist: dist-no-7z
-	@cd out && 7zz a -t7z ../dist.7z .
+	@cd out && 7z a -t7z ../dist.7z .
 	@rm -rf out
diff --git a/meson.build b/meson.build
index 35b6104..93aa265 100644
--- a/meson.build
+++ b/meson.build
@@ -55,6 +55,7 @@ library(
 		zlib_proj.get_variable('zlib_lib'),
 		libtomcrypt.get_variable('tomcryptlib'),
 	],
+	link_args : '-Wl,--allow-multiple-definition',
 	include_directories: [
 		'src',
 		minhook.get_variable('minhook_inc'),
diff --git a/src/constants.h b/src/constants.h
index 33222f1..78063c3 100644
--- a/src/constants.h
+++ b/src/constants.h
@@ -1,6 +1,8 @@
 #pragma once
 #include <xxhash.h>
 
+#define crcPOLY 0x82f63b78
+
 enum class GameVersion : XXH64_hash_t {
     UNKNOWN = 0,
     JPN00   = 0x4C07355966D815FB,
diff --git a/src/dllmain.cpp b/src/dllmain.cpp
index 39e7d61..98985ec 100644
--- a/src/dllmain.cpp
+++ b/src/dllmain.cpp
@@ -5,7 +5,6 @@
 #include "poll.h"
 #include <zlib.h>
 #include <tomcrypt.h>
-#define POLY 0x82f63b78
 
 GameVersion gameVersion = GameVersion::UNKNOWN;
 std::vector<HMODULE> plugins;
@@ -38,7 +37,7 @@ uint32_t crc32c(uint32_t crc, const unsigned char *buf, size_t len)
     while (len--) {
         crc ^= *buf++;
         for (k = 0; k < 8; k++)
-            crc = (crc >> 1) ^ (POLY & (0 - (crc & 1)));
+            crc = (crc >> 1) ^ (crcPOLY & (0 - (crc & 1)));
     }
     return ~crc;
 }