diff --git a/CMakeLists.txt b/CMakeLists.txt
index 09fc85a064f61..435e421c9e24e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -224,7 +224,7 @@ ELSE()
 		-Woverloaded-virtual \
 		-Wpedantic")
     IF(NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-        SET(CATA_WARNINGS "$(CATA_WARNINGS) -Wsuggest-override")
+        SET(CATA_WARNINGS "${CATA_WARNINGS} -Wsuggest-override")
     ENDIF(NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 	# Compact the whitespace in the warning string
 	string(REGEX REPLACE "[\t ]+" " " CATA_WARNINGS "${CATA_WARNINGS}")
diff --git a/doc/DEVELOPER_TOOLING.md b/doc/DEVELOPER_TOOLING.md
index 3c50ab19cf580..ae2f14f195809 100644
--- a/doc/DEVELOPER_TOOLING.md
+++ b/doc/DEVELOPER_TOOLING.md
@@ -263,7 +263,7 @@ to avoid compiler errors.
 python3 <llvm-source-root>/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py \
     -clang-tidy-binary=build/tools/clang-tidy-plugin/CataAnalyzerPlugin.exe \
     -p=build "\.cpp$" \
-    -extra-arg=-target -extra-arg=x86_64-pc-windows-gnu -extra-arg=-pthread -extra-arg=-DSDL_DISABLE_ANALYZE_MACROS \
+    -extra-arg=-target -extra-arg=x86_64-pc-windows-gnu -extra-arg=-pthread -extra-arg=-DSDL_DISABLE_ANALYZE_MACROS -extra-arg=-Wno-unknown-warning-option \
     -extra-arg=-isystem -extra-arg=<llvm-source-root>/clang/lib/Headers
 ```