diff --git a/tensorflow/core/framework/op_kernel.cc b/tensorflow/core/framework/op_kernel.cc
index d2c8f7e564a..789f0fda752 100644
--- a/tensorflow/core/framework/op_kernel.cc
+++ b/tensorflow/core/framework/op_kernel.cc
@@ -118,9 +118,9 @@ OpKernel::OpKernel(OpKernelConstruction* context,
 
 OpKernel::~OpKernel() {}
 
-const uint64 OpKernel::kInitialCostEstimateCycles = 100 * 1000 * 1000;
-const uint64 OpKernel::kOpIsExpensiveThresholdCycles = 5000;
-const uint64 OpKernel::kCostDecay = 10;
+const uint64 OpKernel::kInitialCostEstimateCycles;
+const uint64 OpKernel::kOpIsExpensiveThresholdCycles;
+const uint64 OpKernel::kCostDecay;
 
 const string& OpKernel::name() const { return def_->name(); }
 const string& OpKernel::type_string() const { return def_->op(); }
diff --git a/tensorflow/core/framework/op_kernel.h b/tensorflow/core/framework/op_kernel.h
index 03f5f2e7958..bccb2bf3c76 100644
--- a/tensorflow/core/framework/op_kernel.h
+++ b/tensorflow/core/framework/op_kernel.h
@@ -121,9 +121,9 @@ class OpKernel {
   // Initial time (in CPU cycles) we expect an operation to take.  Used to
   // determine whether an operation should be place in a threadpool.  Operations
   // start out "expensive".
-  static const uint64 kInitialCostEstimateCycles;
-  static const uint64 kOpIsExpensiveThresholdCycles;
-  static const uint64 kCostDecay;
+  static const uint64 kInitialCostEstimateCycles = 100 * 1000 * 1000;
+  static const uint64 kOpIsExpensiveThresholdCycles = 5000;
+  static const uint64 kCostDecay = 10;
 
   // Returns true iff this op kernel is considered "expensive". The
   // runtime may use this flag to optimize graph execution for example