diff --git a/Changelog.md b/Changelog.md
index d73e0083c..c14ac8534 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -16,6 +16,7 @@ Compiler Features:
 
 
 Bugfixes:
+ * JSON ABI: Json description of library ABIs no longer contain functions with internal types like storage structs.
  * SMTChecker: Fix internal compiler error when contract contains too large rational number.
  * Type system: Detect if a contract's base uses types that require the experimental abi encoder while the contract still uses the old encoder
  * Yul Optimizer: Fix visitation order bug for the structural simplifier.
@@ -25,7 +26,6 @@ Build System:
  * Soltest: Add support for arrays in function signatures.
  * Soltest: Add support for struct arrays in function signatures.
 
-
 ### 0.5.5 (2019-03-05)
 
 Language Features:
diff --git a/libsolidity/interface/ABI.cpp b/libsolidity/interface/ABI.cpp
index 3c33eae8e..f8a9c7ec8 100644
--- a/libsolidity/interface/ABI.cpp
+++ b/libsolidity/interface/ABI.cpp
@@ -26,12 +26,31 @@ using namespace std;
 using namespace dev;
 using namespace dev::solidity;
 
+namespace
+{
+bool anyDataStoredInStorage(TypePointers const& _pointers)
+{
+	for (TypePointer const& pointer: _pointers)
+		if (pointer->dataStoredIn(DataLocation::Storage))
+			return true;
+
+	return false;
+}
+}
+
 Json::Value ABI::generate(ContractDefinition const& _contractDef)
 {
 	Json::Value abi(Json::arrayValue);
 
 	for (auto it: _contractDef.interfaceFunctions())
 	{
+		if (
+			_contractDef.isLibrary() &&
+			(it.second->stateMutability() > StateMutability::View ||
+			anyDataStoredInStorage(it.second->parameterTypes() + it.second->returnParameterTypes()))
+		)
+			continue;
+
 		auto externalFunctionType = it.second->interfaceFunctionType();
 		solAssert(!!externalFunctionType, "");
 		Json::Value method;
diff --git a/test/libsolidity/SolidityABIJSON.cpp b/test/libsolidity/SolidityABIJSON.cpp
index 63f2b3a62..3acb56257 100644
--- a/test/libsolidity/SolidityABIJSON.cpp
+++ b/test/libsolidity/SolidityABIJSON.cpp
@@ -755,24 +755,23 @@ BOOST_AUTO_TEST_CASE(library_function)
 		library test {
 			struct StructType { uint a; }
 			function f(StructType storage b, uint[] storage c, test d) public returns (uint[] memory e, StructType storage f) { f = f; }
+			function f1(uint[] memory c, test d) public pure returns (uint[] memory e) {  }
 		}
 	)";
 
 	char const* interface = R"(
 	[
 		{
-			"constant" : false,
+			"constant" : true,
 			"payable" : false,
-			"stateMutability": "nonpayable",
-			"name": "f",
+			"stateMutability": "pure",
+			"name": "f1",
 			"inputs": [
-				{ "name": "b", "type": "test.StructType storage" },
-				{ "name": "c", "type": "uint256[] storage" },
+				{ "name": "c", "type": "uint256[]" },
 				{ "name": "d", "type": "test" }
 			],
 			"outputs": [
-				{ "name": "e", "type": "uint256[]" },
-				{ "name": "f", "type": "test.StructType storage" }
+				{ "name": "e", "type": "uint256[]" }
 			],
 			"type" : "function"
 		}
@@ -1040,13 +1039,13 @@ BOOST_AUTO_TEST_CASE(structs_in_libraries)
 		library L {
 			struct S { uint a; T[] sub; bytes b; }
 			struct T { uint[2] x; }
-			function f(L.S storage s) public {}
-			function g(L.S memory s) public {}
+			function f(L.S storage s) public view {}
+			function g(L.S memory s) public view {}
 		}
 	)";
 	char const* interface = R"(
 	[{
-		"constant": false,
+		"constant": true,
 		"inputs": [
 			{
 				"components": [
@@ -1076,24 +1075,9 @@ BOOST_AUTO_TEST_CASE(structs_in_libraries)
 		"name": "g",
 		"outputs": [],
 		"payable": false,
-		"stateMutability": "nonpayable",
+		"stateMutability": "view",
 		"type": "function"
-	},
-	{
-		"constant": false,
-		"inputs": [
-			{
-				"name": "s",
-				"type": "L.S storage"
-			}
-		],
-		"name": "f",
-		"outputs": [],
-		"payable": false,
-		"stateMutability": "nonpayable",
-		"type": "function"
-	}]
-	)";
+	}])";
 	checkInterface(sourceCode, "L", interface);
 }