diff --git a/doc/build-unix.md b/doc/build-unix.md
index 45433a32b3c..fe77e54fb7b 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -34,7 +34,7 @@ For the default build type `RelWithDebInfo`, the default compile flags are
 
 Finally, clang (often less resource hungry) can be used instead of gcc, which is used by default:
 
-    cmake -B build -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CC_COMPILER=clang
+    cmake -B build -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang
 
 ## Linux Distribution Specific Instructions