diff --git a/Meta/Lagom/Fuzzers/CMakeLists.txt b/Meta/Lagom/Fuzzers/CMakeLists.txt
index e284a88b51..d0e4a5f82d 100644
--- a/Meta/Lagom/Fuzzers/CMakeLists.txt
+++ b/Meta/Lagom/Fuzzers/CMakeLists.txt
@@ -6,11 +6,11 @@ function(add_simple_fuzzer name)
           PUBLIC Lagom)
   else()
     target_compile_options(${name}
-      PRIVATE $<$<C_COMPILER_ID:Clang>:-g -O1 -fsanitize=fuzzer>
+      PRIVATE $<$<CXX_COMPILER_ID:Clang>:-g -O1 -fsanitize=fuzzer>
       )
     target_link_libraries(${name}
       PUBLIC Lagom
-      PRIVATE $<$<C_COMPILER_ID:Clang>:-fsanitize=fuzzer>
+      PRIVATE $<$<CXX_COMPILER_ID:Clang>:-fsanitize=fuzzer>
       )
   endif()
 endfunction()
@@ -53,10 +53,10 @@ set(CMAKE_SHARED_LINKER_FLAGS "${ORIGINAL_CMAKE_SHARED_LINKER_FLAGS} -fsanitize=
 set(CMAKE_MODULE_LINKER_FLAGS "${ORIGINAL_CMAKE_MODULE_LINKER_FLAGS} -fsanitize=address")
 add_executable(FuzzilliJs FuzzilliJs.cpp)
 target_compile_options(FuzzilliJs
-    PRIVATE $<$<C_COMPILER_ID:Clang>:-g -O1 -fsanitize-coverage=trace-pc-guard>
+    PRIVATE $<$<CXX_COMPILER_ID:Clang>:-g -O1 -fsanitize-coverage=trace-pc-guard>
     )
 target_link_libraries(FuzzilliJs
     PUBLIC Lagom
-    PRIVATE $<$<C_COMPILER_ID:Clang>:-fsanitize-coverage=trace-pc-guard>
+    PRIVATE $<$<CXX_COMPILER_ID:Clang>:-fsanitize-coverage=trace-pc-guard>
     )
 endif()
diff --git a/Meta/Lagom/ReadMe.md b/Meta/Lagom/ReadMe.md
index 82558627d4..470eb08930 100644
--- a/Meta/Lagom/ReadMe.md
+++ b/Meta/Lagom/ReadMe.md
@@ -18,7 +18,7 @@ Lagom can be used to fuzz parts of SerenityOS's code base. This requires buildli
 
     # From the root of the SerenityOS checkout:
     mkdir BuildLagom && cd BuildLagom
-    cmake -GNinja -DBUILD_LAGOM=ON -DENABLE_FUZZER_SANITIZER=ON -DENABLE_ADDRESS_SANITIZER=ON -DENABLE_UNDEFINED_SANITIZER=ON -DCMAKE_CXX_COMPILER=clang++ ..
+    cmake -GNinja -DBUILD_LAGOM=ON -DENABLE_FUZZER_SANITIZER=ON -DENABLE_ADDRESS_SANITIZER=ON -DENABLE_UNDEFINED_SANITIZER=ON -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang ..
     ninja Meta/Lagom/all
     # Or as a handy rebuild-rerun line:
     ninja FuzzJs && Meta/Lagom/Fuzzers/FuzzJs