diff --git a/Changelog.md b/Changelog.md
index b36bec2e4..eb0ded829 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -28,6 +28,7 @@ Breaking Changes:
  * Optimizer: Remove the no-op ``PUSH1 0 NOT AND`` sequence.
  * Parser: Disallow trailing dots that are not followed by a number.
  * Parser: Remove ``constant`` as function state mutability modifer.
+ * Type Checker: Disallow values for constants that are not compile-time constants. This was already the case in the experimental 0.5.0 mode.
  * Type Checker: Disallow arithmetic operations for boolean variables.
  * Type Checker: Disallow conversions between ``bytesX`` and ``uintY`` of different size.
  * Type Checker: Disallow specifying base constructor arguments multiple times in the same inheritance hierarchy. This was already the case in the experimental 0.5.0 mode.
diff --git a/libsolidity/analysis/TypeChecker.cpp b/libsolidity/analysis/TypeChecker.cpp
index 3bd0b4c12..676b3cd60 100644
--- a/libsolidity/analysis/TypeChecker.cpp
+++ b/libsolidity/analysis/TypeChecker.cpp
@@ -749,19 +749,10 @@ bool TypeChecker::visit(VariableDeclaration const& _variable)
 		if (!_variable.value())
 			m_errorReporter.typeError(_variable.location(), "Uninitialized \"constant\" variable.");
 		else if (!_variable.value()->annotation().isPure)
-		{
-			if (_variable.sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::V050))
-				m_errorReporter.typeError(
-					_variable.value()->location(),
-					"Initial value for constant variable has to be compile-time constant."
-				);
-			else
-				m_errorReporter.warning(
-					_variable.value()->location(),
-					"Initial value for constant variable has to be compile-time constant. "
-					"This will fail to compile with the next breaking version change."
-				);
-		}
+			m_errorReporter.typeError(
+				_variable.value()->location(),
+				"Initial value for constant variable has to be compile-time constant."
+			);
 	}
 	if (!_variable.isStateVariable())
 	{
diff --git a/test/libsolidity/syntaxTests/constants/assign_constant_function_value.sol b/test/libsolidity/syntaxTests/constants/assign_constant_function_value.sol
index 88e94e29f..0e242b304 100644
--- a/test/libsolidity/syntaxTests/constants/assign_constant_function_value.sol
+++ b/test/libsolidity/syntaxTests/constants/assign_constant_function_value.sol
@@ -3,4 +3,4 @@ contract C {
     uint constant y = x();
 }
 // ----
-// Warning: (74-77): Initial value for constant variable has to be compile-time constant. This will fail to compile with the next breaking version change.
+// TypeError: (74-77): Initial value for constant variable has to be compile-time constant.
diff --git a/test/libsolidity/syntaxTests/nameAndTypeResolution/165_assigning_state_to_const_variable.sol b/test/libsolidity/syntaxTests/nameAndTypeResolution/165_assigning_state_to_const_variable.sol
index f39865807..0de15dfb1 100644
--- a/test/libsolidity/syntaxTests/nameAndTypeResolution/165_assigning_state_to_const_variable.sol
+++ b/test/libsolidity/syntaxTests/nameAndTypeResolution/165_assigning_state_to_const_variable.sol
@@ -2,4 +2,4 @@ contract C {
     address constant x = msg.sender;
 }
 // ----
-// Warning: (38-48): Initial value for constant variable has to be compile-time constant. This will fail to compile with the next breaking version change.
+// TypeError: (38-48): Initial value for constant variable has to be compile-time constant.