diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 73d7db71888..6801a8fa3aa 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -2721,7 +2721,7 @@ namespace ts {
                     createDiagnosticForOptionName(Diagnostics.Composite_projects_may_not_disable_declaration_emit, "declaration");
                 }
                 if (options.incremental === false) {
-                    createDiagnosticForOptionName(Diagnostics.Composite_projects_may_not_disable_declaration_emit, "declaration");
+                    createDiagnosticForOptionName(Diagnostics.Composite_projects_may_not_disable_incremental_compilation, "declaration");
                 }
             }
 
diff --git a/tests/baselines/reference/optionsCompositeWithIncrementalFalse.errors.txt b/tests/baselines/reference/optionsCompositeWithIncrementalFalse.errors.txt
index bbdd1d4bba2..404028d5311 100644
--- a/tests/baselines/reference/optionsCompositeWithIncrementalFalse.errors.txt
+++ b/tests/baselines/reference/optionsCompositeWithIncrementalFalse.errors.txt
@@ -1,7 +1,7 @@
-error TS6304: Composite projects may not disable declaration emit.
+error TS6379: Composite projects may not disable incremental compilation.
 
 
-!!! error TS6304: Composite projects may not disable declaration emit.
+!!! error TS6379: Composite projects may not disable incremental compilation.
 ==== tests/cases/compiler/optionsCompositeWithIncrementalFalse.ts (0 errors) ====
     const x = "Hello World";
     
\ No newline at end of file