diff --git a/src/org/SHS/SDK.groovy b/src/org/SHS/SDK.groovy
index db10d4c..9a842c2 100644
--- a/src/org/SHS/SDK.groovy
+++ b/src/org/SHS/SDK.groovy
@@ -40,6 +40,7 @@ class SDK {
 			pl.forEach ({ dist, cmake_toolchain ->
 				//steps.print("compile in ${dist.docker_image} with arg ${cmake_toolchain}")
 				steps.docker.image("${dist.docker_image}-shs-${tag}").inside() {
+					steps.sh "rm -rf build || true"
 					steps.sh "mkdir -p build"
 					steps.sh "cd build && cmake -G Ninja ${cmake_toolchain} -DCMAKE_PREFIX_PATH=/soft/SHS/sdk -DBUILD_NUMBER=${steps.env.BUILD_NUMBER} -DCMAKE_INSTALL_PREFIX=`pwd`/../release/${tag} ../"
 					steps.sh "cd build && cmake --build ./ --target install -j${steps.env.JOBS_COUNT}"