diff --git a/default.conf b/default.conf
index e4abe6b0b7..e85b2c71b6 100644
--- a/default.conf
+++ b/default.conf
@@ -17,7 +17,6 @@ export CARGO_PROFILE_RELEASE_OPT_LEVEL="s"
 export CARGO_PROFILE_RELEASE_PANIC="abort"
 export CARGO_PROFILE_RELEASE_CODEGEN_UNITS=1
 export CARGO_PROFILE_RELEASE_LTO="true"
-export CARGO_REGISTRIES_CRATES_IO_PROTOCOL="sparse"
 
 export CTEST_OUTPUT_ON_FAILURE=ON
 export CTEST_NO_TESTS_ACTION=error