diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8f27906206..994b19a7846 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.16)
 project(SerenityOS C CXX ASM)
 
 if(NOT "${CMAKE_BUILD_TYPE}" STREQUAL "")
-  message(FATAL
+  message(FATAL_ERROR
     ": Don't use CMAKE_BUILD_TYPE when building serenity.\n"
     "The default build type is optimized with debug info and asserts enabled,\n"
     "and that's all there is.")
diff --git a/Kernel/CMakeLists.txt b/Kernel/CMakeLists.txt
index 3e699f4ea3d..5bb5e189b7f 100644
--- a/Kernel/CMakeLists.txt
+++ b/Kernel/CMakeLists.txt
@@ -353,7 +353,7 @@ if (${CMAKE_HOST_SYSTEM_NAME} MATCHES SerenityOS)
     include_directories(/usr/local/include/c++/${GCC_VERSION}/)
 else()
     if (NOT EXISTS ${TOOLCHAIN_ROOT}/Kernel/${SERENITY_ARCH}-pc-serenity/include/c++/${GCC_VERSION}/)
-        message(SEND_ERROR "Toolchain version ${GCC_VERSION} appears to be missing! Please run: Meta/serenity.sh rebuild-toolchain")
+        message(FATAL_ERROR "Toolchain version ${GCC_VERSION} appears to be missing! Please run: Meta/serenity.sh rebuild-toolchain")
     endif()
     include_directories(${TOOLCHAIN_ROOT}/Kernel/${SERENITY_ARCH}-pc-serenity/include/c++/${GCC_VERSION}/)
     include_directories(${TOOLCHAIN_ROOT}/Kernel/${SERENITY_ARCH}-pc-serenity/include/c++/${GCC_VERSION}/${SERENITY_ARCH}-pc-serenity/)
diff --git a/Meta/CMake/utils.cmake b/Meta/CMake/utils.cmake
index a57cee686ce..1c52d1306d2 100644
--- a/Meta/CMake/utils.cmake
+++ b/Meta/CMake/utils.cmake
@@ -98,7 +98,7 @@ function(serenity_app target_name)
     if (EXISTS "${small_icon}")
         embed_resource("${target_name}" serenity_icon_s "${small_icon}")
     else()
-        message(WARNING "Missing small app icon: ${small_icon}")
+        message(FATAL_ERROR "Missing small app icon: ${small_icon}")
     endif()
 
     if (EXISTS "${medium_icon}")