diff --git a/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/ValueParsers.java b/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/ValueParsers.java
index bf81fcd10..ce5f6d68b 100644
--- a/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/ValueParsers.java
+++ b/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/ValueParsers.java
@@ -39,11 +39,7 @@ public class ValueParsers {
 				str = str.replace("_", ""); //Tolerate and ignore underscores in integers.
 				int value = Integer.parseInt(str);
 				if (lowerBound!=null && value<lowerBound) {
-					if (lowerBound==0) {
-						throw new NumberFormatException("Value must be positive");
-					} else {
-						throw new NumberFormatException("Value must be at least "+lowerBound);
-					}
+					throw new NumberFormatException("Value must be at least "+lowerBound);
 				}
 				if (upperBound!=null && value>upperBound) {
 					throw new NumberFormatException("Value must be at most "+upperBound);
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 f86afebcb..50d8cf43e 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
@@ -513,7 +513,7 @@ public class ConcourseEditorTest {
 		);
 		editor.assertProblems(
 				"boohoo|boolean",
-				"-1|must be positive",
+				"-1|must be at least 0",
 				"git|resource does not exist",
 				"yohoho|boolean",
 				"0|must be at least 1",
@@ -1338,7 +1338,7 @@ public class ConcourseEditorTest {
 				"      clean_tags: not-bool-d\n"
 		);
 		editor.assertProblems(
-				"-1|must be positive",
+				"-1|must be at least 0",
 				"not-bool-a|'boolean'",
 				"not-bool-b|'boolean'",
 				"not-bool-c|'boolean'",