diff --git a/tests/integration/common.sh b/tests/integration/common.sh
index 2f14864e..4b5f99b0 100755
--- a/tests/integration/common.sh
+++ b/tests/integration/common.sh
@@ -29,14 +29,7 @@
 
 ## This file defines constants and common functions for test cases.
 
-if [ "$(uname)" = "Linux" ]; then
-    echo "OS is Linux"
-    readonly CUR_DIR="$(dirname "$(realpath -s "$0")")"
-elif [ "$(uname)" = "Darwin" ]; then
-    echo "OS is Darwin"
-    readonly CUR_DIR="$(dirname "$(realpath "$0")")"
-fi
-
+readonly CUR_DIR="$(dirname "$(realpath -s "$0")")"
 readonly TEST_ROOT_DIR=${CUR_DIR}
 
 readonly RUNTIME_DIR=/tmp/test-ot-commissioner