diff --git a/llvm/include/llvm/ADT/GenericUniformityImpl.h b/llvm/include/llvm/ADT/GenericUniformityImpl.h
index ddd0746ccd916..b7d0a1228ebfc 100644
--- a/llvm/include/llvm/ADT/GenericUniformityImpl.h
+++ b/llvm/include/llvm/ADT/GenericUniformityImpl.h
@@ -49,8 +49,6 @@
 
 #define DEBUG_TYPE "uniformity"
 
-using namespace llvm;
-
 namespace llvm {
 
 template <typename Range> auto unique(Range &&R) {
diff --git a/llvm/include/llvm/Transforms/IPO/FunctionSpecialization.h b/llvm/include/llvm/Transforms/IPO/FunctionSpecialization.h
index 59378bc10873e..50f9aae73dc53 100644
--- a/llvm/include/llvm/Transforms/IPO/FunctionSpecialization.h
+++ b/llvm/include/llvm/Transforms/IPO/FunctionSpecialization.h
@@ -84,8 +84,6 @@
 #include "llvm/Transforms/Utils/SCCPSolver.h"
 #include "llvm/Transforms/Utils/SizeOpts.h"
 
-using namespace llvm;
-
 namespace llvm {
 // Map of potential specializations for each function. The FunctionSpecializer
 // keeps the discovered specialisation opportunities for the module in a single
diff --git a/llvm/include/llvm/Transforms/Instrumentation/CFGMST.h b/llvm/include/llvm/Transforms/Instrumentation/CFGMST.h
index 269441db7a558..6ed8a6c6eaf01 100644
--- a/llvm/include/llvm/Transforms/Instrumentation/CFGMST.h
+++ b/llvm/include/llvm/Transforms/Instrumentation/CFGMST.h
@@ -28,8 +28,6 @@
 
 #define DEBUG_TYPE "cfgmst"
 
-using namespace llvm;
-
 namespace llvm {
 
 /// An union-find based Minimum Spanning Tree for CFG