diff --git a/cmake/README.md b/cmake/README.md
index f4b6253720..ad7e525bba 100644
--- a/cmake/README.md
+++ b/cmake/README.md
@@ -17,7 +17,7 @@ protobuf requires C++14 or newer, sometimes you will need to explicitly override
 this.  For example, the following:
 
     cmake . -DCMAKE_CXX_STANDARD=14
-    cmake --build
+    cmake --build .
 
 will build protobuf using C++14 (see [CXX_STANDARD](https://cmake.org/cmake/help/latest/prop_tgt/CXX_STANDARD.html#prop_tgt:CXX_STANDARD){.external} for all available options).