diff --git a/src/eoc.js b/src/eoc.js
index 2461840b..5ba22c88 100755
--- a/src/eoc.js
+++ b/src/eoc.js
@@ -234,6 +234,7 @@ program.command('compile')
 program.command('link')
   .description('Link together all binaries into a single executable binary')
   .action(async (str, opts) => {
+    pin(program.opts());
     clear(str);
     if (program.opts().alone === undefined) {
       await pipe()(coms(), ['register', 'assemble', 'lint', 'resolve', 'transpile', 'compile', 'link'], program.opts());
@@ -341,6 +342,7 @@ program.command('jeo:assemble')
     'classes'
   )
   .action((str, opts) => {
+    pin(program.opts());
     coms().jeo_assemble({...program.opts(), ...str});
   });
 
diff --git a/test/test_eoc.js b/test/test_eoc.js
index ef403f9f..d3189064 100644
--- a/test/test_eoc.js
+++ b/test/test_eoc.js
@@ -59,3 +59,21 @@ describe('eoc', () => {
     done();
   });
 });
+
+describe('eoc', () => {
+  before(weAreOnline);
+  it('fails link due to version mismatch if different --pin provided', (done) => {
+    assert.throws(
+      () => { runSync(['--pin=29.9.4', '--alone', 'link']); },
+      /Version mismatch: you are running eoc [0-9]+\.[0-9]+\.[0-9]+, but --pin option requires 29.9.4/
+    );
+    done();
+  });
+  it('fails jeo:assemble due to version mismatch if different --pin provided', (done) => {
+    assert.throws(
+      () => { runSync(['--pin=29.9.4', 'jeo:assemble']); },
+      /Version mismatch: you are running eoc [0-9]+\.[0-9]+\.[0-9]+, but --pin option requires 29.9.4/
+    );
+    done();
+  });
+});