diff --git a/doc/gettingstarted.rst b/doc/gettingstarted.rst
index 4e59e51..b5191e7 100644
--- a/doc/gettingstarted.rst
+++ b/doc/gettingstarted.rst
@@ -140,7 +140,7 @@ By default the CMake_ project will generate build files for building the
 static library. To build the shared version use::
 
     ...
-    cmake -DBUILD_SHARED=1 ..
+    cmake -DJANSSON_BUILD_SHARED_LIBS=1 ..
 
 Changing install directory (same as autoconf --prefix)
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