diff --git a/packages/core/schematics/migrations/static-queries/migration.ts b/packages/core/schematics/migrations/static-queries/migration.ts
index d54a08b784..57b7822119 100644
--- a/packages/core/schematics/migrations/static-queries/migration.ts
+++ b/packages/core/schematics/migrations/static-queries/migration.ts
@@ -25,6 +25,16 @@ import {parseTsconfigFile} from './typescript/tsconfig';
 export function runStaticQueryMigration(tree: Tree, tsconfigPath: string, basePath: string) {
   const parsed = parseTsconfigFile(tsconfigPath, dirname(tsconfigPath));
   const host = ts.createCompilerHost(parsed.options, true);
+
+  // We need to overwrite the host "readFile" method, as we want the TypeScript
+  // program to be based on the file contents in the virtual file tree. Otherwise
+  // if we run the migration for multiple tsconfig files which have intersecting
+  // source files, it can end up updating query definitions multiple times.
+  host.readFile = fileName => {
+    const buffer = tree.read(relative(basePath, fileName));
+    return buffer ? buffer.toString() : undefined;
+  };
+
   const program = ts.createProgram(parsed.fileNames, parsed.options, host);
   const typeChecker = program.getTypeChecker();
   const queryVisitor = new NgQueryResolveVisitor(typeChecker);
diff --git a/packages/core/schematics/test/static_queries_migration_spec.ts b/packages/core/schematics/test/static_queries_migration_spec.ts
index 8bd207ceed..dc23eae3b0 100644
--- a/packages/core/schematics/test/static_queries_migration_spec.ts
+++ b/packages/core/schematics/test/static_queries_migration_spec.ts
@@ -710,5 +710,30 @@ describe('static-queries migration', () => {
       expect(tree.readContent('/index.ts'))
           .toContain(`@${queryType}('test', { static: true }) query2: any;`);
     });
+
+    it('should properly handle multiple tsconfig files', () => {
+      writeFile('/src/index.ts', `
+        import {Component, ${queryType}} from '@angular/core';
+                        
+        @Component({template: '<span #test></span>'})
+        export class MyComp {
+          private @${queryType}('test') query: any;
+        }
+      `);
+
+      writeFile('/src/tsconfig.json', JSON.stringify({
+        compilerOptions: {
+          lib: ['es2015'],
+        }
+      }));
+
+      // The migration runs for "/tsconfig.json" and "/src/tsconfig.json" which both
+      // contain the "src/index.ts" file. This test ensures that we don't incorrectly
+      // apply the code transformation multiple times with outdated offsets.
+      runMigration();
+
+      expect(tree.readContent('/src/index.ts'))
+          .toContain(`@${queryType}('test', { static: false }) query: any;`);
+    });
   }
 });