diff --git a/contracts/TokenDelegator.sol b/contracts/TokenDelegator.sol
index 5efad45..5061b9c 100644
--- a/contracts/TokenDelegator.sol
+++ b/contracts/TokenDelegator.sol
@@ -37,7 +37,7 @@ contract TokenDelegator is TokenDelegatorStorage, TokenEvents {
      */
     function _setImplementation(address implementation_) external isMaster {
         require(implementation_ != address(0), "TokenDelegator::_setImplementation: invalid implementation address");
-        require(block.timestamp >=changeImplementationAfter, "TokenDelegator::_setImplementation: can change implementation changeImplementationAfter time only");
+        require(block.timestamp >= changeImplementationAfter, "TokenDelegator::_setImplementation: can change implementation changeImplementationAfter time only");
 
         address oldImplementation = implementation;
         implementation = implementation_;
@@ -78,4 +78,4 @@ contract TokenDelegator is TokenDelegatorStorage, TokenEvents {
             default { return(free_mem_ptr, returndatasize()) }
         }
     }
-}
\ No newline at end of file
+}