diff --git a/gitlab/build-mingw b/gitlab/build-mingw
index 59c5a928..c9d3b9f7 100755
--- a/gitlab/build-mingw
+++ b/gitlab/build-mingw
@@ -13,7 +13,7 @@ mkdir build
 cd build
 mkdir vulkan-headers
 cp -r /usr/include/vulkan /usr/include/vk_video /usr/include/spirv vulkan-headers
-../configure --enable-demos --disable-doxygen-doc --without-ncurses --host=$HOST SONAME_LIBVULKAN="vulkan-1.dll" CPPFLAGS="-I$PWD/vulkan-headers" CFLAGS="-g -O2 -Wno-format -Wno-array-bounds -Wno-missing-prototypes -Wno-discarded-qualifiers -Wno-incompatible-pointer-types -Werror" LDFLAGS="-static-libgcc" && \
+../configure --enable-demos --disable-doxygen-doc --without-ncurses --host=$HOST SONAME_LIBVULKAN="vulkan-1.dll" CPPFLAGS="-I$PWD/vulkan-headers" CFLAGS="-g -O2 -Wno-format -Wno-array-bounds -Wno-missing-prototypes -Wno-incompatible-pointer-types -Werror" LDFLAGS="-static-libgcc" && \
     make -j$(nproc) && \
     make -j$(nproc) install DESTDIR="$PWD/destdir" || \
         touch ../pipeline_failed
diff --git a/libs/vkd3d-common/blob.c b/libs/vkd3d-common/blob.c
index c46abb55..0f6d5a5e 100644
--- a/libs/vkd3d-common/blob.c
+++ b/libs/vkd3d-common/blob.c
@@ -18,6 +18,7 @@
 
 #define COBJMACROS
 #define INITGUID
+#define CONST_VTABLE
 #include "vkd3d.h"
 #include "vkd3d_blob.h"
 #include "vkd3d_debug.h"
diff --git a/libs/vkd3d/vkd3d_private.h b/libs/vkd3d/vkd3d_private.h
index 89f8b15e..d20651cc 100644
--- a/libs/vkd3d/vkd3d_private.h
+++ b/libs/vkd3d/vkd3d_private.h
@@ -22,6 +22,7 @@
 #define COBJMACROS
 #define NONAMELESSUNION
 #define VK_NO_PROTOTYPES
+#define CONST_VTABLE
 
 #ifdef _WIN32
 # define _WIN32_WINNT 0x0600  /* for condition variables */