diff --git a/external/MbedTLS/MbedTLS.cmake b/external/MbedTLS/MbedTLS.cmake
index 16b67d9..ec39e83 100644
--- a/external/MbedTLS/MbedTLS.cmake
+++ b/external/MbedTLS/MbedTLS.cmake
@@ -112,9 +112,8 @@
 				-DEXTERNAL_DEFINITIONS=-DMBEDTLS_USER_CONFIG_FILE="${MBEDTLS_USER_CONFIG_FILE}"
 				-DEXTERNAL_INCLUDE_PATHS=${MBEDTLS_EXTRA_INCLUDES}
 				-GUnix\ Makefiles
-				${MBEDTLS_SOURCE_DIR}
-		WORKING_DIRECTORY
-			${MBEDTLS_BINARY_DIR}
+				-S ${MBEDTLS_SOURCE_DIR}
+		 		-B ${MBEDTLS_BINARY_DIR}
 		RESULT_VARIABLE _exec_error
 	)