diff --git a/src/QirRuntime/.gitignore b/src/QirRuntime/.gitignore
new file mode 100644
index 00000000000..b01c4cb32d9
--- /dev/null
+++ b/src/QirRuntime/.gitignore
@@ -0,0 +1,10 @@
+# These auto-generated files bother when switching between the branches.
+samples/StandaloneInputReference/qir-standalone-input-reference.ll
+samples/StandaloneInputReference/qsharp/qir/
+test/FullstateSimulator/qir-test-simulator.ll
+test/FullstateSimulator/qsharp/qir/
+test/QIR-dynamic/qir-test-random.ll
+test/QIR-dynamic/qsharp/qir/
+test/QIR-tracer/qsharp/qir/
+test/QIR-tracer/tracer-qir.ll
+