diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 608fbdda..a02bc3ac 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -336,6 +336,11 @@ jobs:
           export RANLIB=$TOOLCHAIN/bin/llvm-ranlib
           export STRIP=$TOOLCHAIN/bin/llvm-strip
           export PKG_CONFIG_PATH=$DEPS_DIR/lib/pkgconfig
+          case "$ABI" in
+            armeabi-v7a)
+              CPU="-mthumb"
+              ;;
+          esac
 
           # netfilter libs
           wget -qO- https://www.netfilter.org/pub/libnfnetlink/libnfnetlink-1.0.2.tar.bz2 | tar -xj
@@ -346,7 +351,7 @@ jobs:
           for i in libmnl libnfnetlink libnetfilter_queue ; do
             (
               cd $i-*
-              CFLAGS="-Os -flto=auto -Wno-implicit-function-declaration" \
+              CFLAGS="$CPU -Os -flto=auto -Wno-implicit-function-declaration" \
               ./configure --prefix= --host=$TARGET --enable-static --disable-shared --disable-dependency-tracking
               make install -j$(nproc) DESTDIR=$DEPS_DIR
             )
@@ -354,7 +359,7 @@ jobs:
           done
 
           # zapret
-          CFLAGS="-DZAPRET_GH_VER=${{ github.ref_name }} -DZAPRET_GH_HASH=${{ github.sha }} -I$DEPS_DIR/include" \
+          CFLAGS="$CPU -DZAPRET_GH_VER=${{ github.ref_name }} -DZAPRET_GH_HASH=${{ github.sha }} -I$DEPS_DIR/include" \
           LDFLAGS="-L$DEPS_DIR/lib" \
           make -C zapret android -j$(nproc)