diff --git a/mingw-w64-libheif/PKGBUILD b/mingw-w64-libheif/PKGBUILD
index d2867cf5d9..592c9f1773 100644
--- a/mingw-w64-libheif/PKGBUILD
+++ b/mingw-w64-libheif/PKGBUILD
@@ -4,7 +4,7 @@ _realname=libheif
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}")
 pkgver=1.12.0
-pkgrel=6
+pkgrel=7
 pkgdesc="HEIF image decoder/encoder library and tools (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32')
@@ -58,14 +58,14 @@ build() {
     extra_config+=("-DCMAKE_BUILD_TYPE=Debug")
   fi
 
-  # Keep flag due to https://github.com/strukturag/libheif/issues/357
-  CPPFLAGS+=" -DX265_API_IMPORTS=1"
+  # Keep "-DX265_API_IMPORTS" flag due to https://github.com/strukturag/libheif/issues/357
   MSYS2_ARG_CONV_EXCL="-DCMAKE_INSTALL_PREFIX=" \
     ${MINGW_PREFIX}/bin/cmake \
       -GNinja \
       -DCMAKE_INSTALL_PREFIX=${MINGW_PREFIX} \
       "${extra_config[@]}" \
       -DBUILD_SHARED_LIBS=ON \
+      -DX265_CFLAGS="-DX265_API_IMPORTS" \
       ../${_realname}-${pkgver}
 
   ${MINGW_PREFIX}/bin/cmake --build .