diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 9e1afc218ae..d4f32d98ea4 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -20903,10 +20903,10 @@ namespace ts {
                 switch (operatorToken.kind) {
                     case SyntaxKind.EqualsEqualsEqualsToken:
                     case SyntaxKind.EqualsEqualsToken:
-                        return chainDiagnosticMessages(elaboration, Diagnostics.The_types_of_these_values_indicates_that_this_condition_will_always_be_0, "false");
+                        return chainDiagnosticMessages(elaboration, Diagnostics.The_types_of_these_values_indicate_that_this_condition_will_always_be_0, "false");
                     case SyntaxKind.ExclamationEqualsEqualsToken:
                     case SyntaxKind.ExclamationEqualsToken:
-                        return chainDiagnosticMessages(elaboration, Diagnostics.The_types_of_these_values_indicates_that_this_condition_will_always_be_0, "true");
+                        return chainDiagnosticMessages(elaboration, Diagnostics.The_types_of_these_values_indicate_that_this_condition_will_always_be_0, "true");
                     }
                 return elaboration;
             }
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 362c41e9d58..5550cad86b7 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -1252,7 +1252,7 @@
         "category": "Error",
         "code": 2366
     },
-    "The types of these values indicates that this condition will always be '{0}'.": {
+    "The types of these values indicate that this condition will always be '{0}'.": {
         "category": "Error",
         "code": 2367
     },
diff --git a/src/testRunner/unittests/tsserverProjectSystem.ts b/src/testRunner/unittests/tsserverProjectSystem.ts
index 81d486b4b10..d626692e91a 100644
--- a/src/testRunner/unittests/tsserverProjectSystem.ts
+++ b/src/testRunner/unittests/tsserverProjectSystem.ts
@@ -4999,7 +4999,7 @@ namespace ts.projectSystem {
             );
             const errorResult = <protocol.Diagnostic[]>session.executeCommand(getErrRequest).response;
             assert.isTrue(errorResult.length === 1);
-            assert.equal(errorResult[0].code, Diagnostics.The_types_of_these_values_indicates_that_this_condition_will_always_be_0.code);
+            assert.equal(errorResult[0].code, Diagnostics.The_types_of_these_values_indicate_that_this_condition_will_always_be_0.code);
         });
 
         it("should report semantic errors for configured js project with '// @ts-check' and skipLibCheck=true", () => {
@@ -5026,7 +5026,7 @@ namespace ts.projectSystem {
             );
             const errorResult = <protocol.Diagnostic[]>session.executeCommand(getErrRequest).response;
             assert.isTrue(errorResult.length === 1);
-            assert.equal(errorResult[0].code, Diagnostics.The_types_of_these_values_indicates_that_this_condition_will_always_be_0.code);
+            assert.equal(errorResult[0].code, Diagnostics.The_types_of_these_values_indicate_that_this_condition_will_always_be_0.code);
         });
 
         it("should report semantic errors for configured js project with checkJs=true and skipLibCheck=true", () => {
@@ -5055,7 +5055,7 @@ namespace ts.projectSystem {
             );
             const errorResult = <protocol.Diagnostic[]>session.executeCommand(getErrRequest).response;
             assert.isTrue(errorResult.length === 1);
-            assert.equal(errorResult[0].code, Diagnostics.The_types_of_these_values_indicates_that_this_condition_will_always_be_0.code);
+            assert.equal(errorResult[0].code, Diagnostics.The_types_of_these_values_indicate_that_this_condition_will_always_be_0.code);
         });
     });