diff --git a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseModel.java b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseModel.java
index 81fe49912..1a4866160 100644
--- a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseModel.java
+++ b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseModel.java
@@ -372,25 +372,27 @@ public class ConcourseModel {
 		});
 	}
 
-	public Multiset<String> getResourceTypeNames(DynamicSchemaContext dc) {
-		Collection<YValueHint> hints = getResourceTypeNameHints(dc);
+	public Multiset<String> getResourceTypeNames(DynamicSchemaContext dc, boolean includeBuiltin) {
+		Collection<YValueHint> hints = getResourceTypeNameHints(dc, includeBuiltin);
 		if (hints!=null) {
 			return ImmutableMultiset.copyOf(YTypeFactory.values(hints));
 		}
 		return null;
 	}
 
-	public Collection<YValueHint> getResourceTypeNameHints(DynamicSchemaContext dc) {
+	public Collection<YValueHint> getResourceTypeNameHints(DynamicSchemaContext dc, boolean includeBuiltin) {
 		IDocument doc = dc.getDocument();
 		Multiset<String> userDefined = getStringsFromAst(doc, RESOURCE_TYPE_NAMES_PATH);
 		if (userDefined!=null) {
 			Builder<YValueHint> builder = ImmutableMultiset.builder();
 			builder.addAll(YTypeFactory.hints(userDefined));
-			builder.addAll(
-					Arrays.stream(PipelineYmlSchema.BUILT_IN_RESOURCE_TYPES)
-					.map(h -> addExtraInsertion(h, dc))
-					.collect(Collectors.toList())
-			);
+			if (includeBuiltin) {
+				builder.addAll(
+						Arrays.stream(PipelineYmlSchema.BUILT_IN_RESOURCE_TYPES)
+						.map(h -> addExtraInsertion(h, dc))
+						.collect(Collectors.toList())
+				);
+			}
 			return builder.build();
 		}
 		return null;
diff --git a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseValueParsers.java b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseValueParsers.java
index a0564e2ac..2e19f4a44 100644
--- a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseValueParsers.java
+++ b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/ConcourseValueParsers.java
@@ -49,7 +49,7 @@ public class ConcourseValueParsers {
 	}
 
 	public static SchemaContextAware<ValueParser> resourceTypeNameDef(ConcourseModel models) {
-		return acceptOnlyUniqueNames(models::getResourceTypeNames, "resource-type name");
+		return acceptOnlyUniqueNames(dc -> models.getResourceTypeNames(dc, false), "resource-type name");
 	}
 
 	public static SchemaContextAware<ValueParser> acceptOnlyUniqueNames(
diff --git a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java
index adc1e3b21..7ae77c52a 100644
--- a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java
+++ b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java
@@ -183,7 +183,7 @@ public class PipelineYmlSchema implements YamlSchema {
 					return "The '"+parseString+"' Resource Type does not exist. Existing types: "+validValues;
 				},
 				(DynamicSchemaContext dc) -> {
-					return PartialCollection.compute(() -> models.getResourceTypeNameHints(dc));
+					return PartialCollection.compute(() -> models.getResourceTypeNameHints(dc, true));
 				}
 		);
 
diff --git a/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java b/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java
index ff3841e2c..0108bff9e 100644
--- a/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java
+++ b/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java
@@ -732,6 +732,42 @@ public class ConcourseEditorTest {
 		);
 	}
 
+	@Test
+	public void reconcileDuplicateResourceTypeNames_exempt_Builtins() throws Exception {
+		//See https://github.com/spring-projects/sts4/issues/196
+		Editor editor;
+
+		//Redefintion of built-in resource-type: no errors!
+		editor = harness.newEditor(
+				"resource_types:\n" +
+				"- name: docker-image\n" +
+				"  privileged: true\n" +
+				"  type: docker-image\n" +
+				"  source:\n" +
+				"    repository: concourse/docker-image-resource"
+		);
+		editor.assertProblems(/*None*/);
+
+		//... unless they are redefined twice...
+		editor = harness.newEditor(
+				"resource_types:\n" +
+				"- name: docker-image\n" +
+				"  privileged: true\n" +
+				"  type: docker-image\n" +
+				"  source:\n" +
+				"    repository: concourse/docker-image-resource\n" +
+				"- name: docker-image\n" +
+				"  privileged: true\n" +
+				"  type: docker-image\n" +
+				"  source:\n" +
+				"    repository: concourse/docker-image-resource"
+		);
+		editor.assertProblems(
+				"docker-image|Duplicate",
+				"docker-image|Duplicate"
+		);
+	}
+
 	@Test
 	public void violatedPropertyConstraintsAreWarnings() throws Exception {
 		Editor editor;