diff --git a/src/org/SHS/SDK.groovy b/src/org/SHS/SDK.groovy
index fa5392b..1eb55a7 100644
--- a/src/org/SHS/SDK.groovy
+++ b/src/org/SHS/SDK.groovy
@@ -25,7 +25,7 @@ class SDK {
 		}
 		//steps.print("Finally")
 		//steps.print("file: /${steps.env.SHSSDK_DIR}/platforms.json")
-		pl._root = steps.readJSON(file: '${steps.env.SHSSDK_DIR}/platforms.json')
+		pl._root = steps.readJSON(file: "${steps.env.SHSSDK_DIR}/platforms.json")
 		pl.forEach ({ dist, cmake_toolchain ->
 			print("compile in ${dist.docker_image} with arg ${cmake_toolchain}")
 			// steps.docker.image("${dist.docker_image}-shssdk").inside() {