diff --git a/dwio/nimble/tools/EncodingSelectionLogger.cpp b/dwio/nimble/tools/EncodingSelectionLogger.cpp
index fcefa44..7a24368 100644
--- a/dwio/nimble/tools/EncodingSelectionLogger.cpp
+++ b/dwio/nimble/tools/EncodingSelectionLogger.cpp
@@ -36,7 +36,7 @@ DEFINE_string(
 DEFINE_string(read_factors, "", "Read factors to use for encoding selection.");
 DEFINE_double(compression_acceptance_ratio, 0.9, "");
 
-using namespace ::facebook;
+using namespace facebook;
 
 template <typename T>
 void logEncodingSelection(const std::vector<std::string>& source) {
diff --git a/dwio/nimble/tools/NimbleDump.cpp b/dwio/nimble/tools/NimbleDump.cpp
index 885f8a0..e7d0f3f 100644
--- a/dwio/nimble/tools/NimbleDump.cpp
+++ b/dwio/nimble/tools/NimbleDump.cpp
@@ -25,7 +25,7 @@
 #include "folly/cli/NestedCommandLineApp.h"
 #include "velox/common/base/StatsReporter.h"
 
-using namespace ::facebook;
+using namespace facebook;
 namespace po = ::boost::program_options;
 
 template <typename T>