diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f9738c1a92..e84126ad8f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -468,7 +468,7 @@ endif()
 
 if(PREV_STAGE)
   add_custom_target(update-stage0
-    COMMAND cmake -E env CSRCS=${CMAKE_BINARY_DIR}/lib/temp bash script/update-stage0
+    COMMAND bash -c 'CSRCS=${CMAKE_BINARY_DIR}/lib/temp script/update-stage0'
     DEPENDS make_stdlib
     WORKING_DIRECTORY "${LEAN_SOURCE_DIR}/..")
 endif()