diff --git a/docker/linux/build.sh b/docker/linux/build.sh
index c2c8d4f..6483e88 100755
--- a/docker/linux/build.sh
+++ b/docker/linux/build.sh
@@ -11,7 +11,7 @@ then
     export AR=aarch64-linux-gnu-ar
 elif [ "$ARCH" = "armhf" ]
 then
-    EXTRA_CMAKE_FLAGS="-DCMAKE_CROSSCOMPILING=ON -DCMAKE_SYSTEM_PROCESSOR=armhf -DCMAKE_SYSTEM_NAME=Linux -DCMAKE_C_FLAGS=\"-march=armv6zk -mfpu=vfp -mfloat-abi=hard -marm\""
+    EXTRA_CMAKE_FLAGS='-DCMAKE_CROSSCOMPILING=ON -DCMAKE_SYSTEM_PROCESSOR=armhf -DCMAKE_SYSTEM_NAME=Linux -DCMAKE_C_FLAGS="-march=armv6zk -mfpu=vfp -mfloat-abi=hard -marm"'
     export PKG_CONFIG_PATH=/usr/lib/arm-linux-gnueabihf/pkgconfig
     export PATH=$PATH:/usr/lib/arm-linux-gnueabihf
     export CC=arm-linux-gnueabihf-gcc