diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index e8b55e4..5ccf5cc 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -1,8 +1,15 @@
-if(WHOA_SYSTEM_WIN)
+if (WHOA_SYSTEM_WIN)
     file(GLOB PRIVATE_SOURCES "win/*.cpp" "win/Whoa.rc")
 
     add_executable(Whoa WIN32 ${PRIVATE_SOURCES})
 
+    if (CMAKE_BUILD_TYPE STREQUAL "Debug")
+        target_compile_definitions(Whoa
+            PRIVATE
+                -DWHOA_APP_DEBUG
+        )
+    endif ()
+
     target_link_libraries(Whoa
         PRIVATE
             client
@@ -11,9 +18,9 @@ if(WHOA_SYSTEM_WIN)
             net
             util
         )
-endif()
+endif ()
 
-if(WHOA_SYSTEM_MAC)
+if (WHOA_SYSTEM_MAC)
     file(GLOB PRIVATE_SOURCES "mac/*.cpp" "mac/*.mm")
 
     set_source_files_properties(${PRIVATE_SOURCES}
@@ -35,9 +42,9 @@ if(WHOA_SYSTEM_MAC)
     )
 
     install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/mac/MainMenu.nib DESTINATION "bin")
-endif()
+endif ()
 
-if(WHOA_SYSTEM_LINUX)
+if (WHOA_SYSTEM_LINUX)
     file(GLOB PRIVATE_SOURCES "linux/*.cpp")
 
     add_executable(Whoa ${PRIVATE_SOURCES})
@@ -50,7 +57,7 @@ if(WHOA_SYSTEM_LINUX)
             net
             util
     )
-endif()
+endif ()
 
 target_include_directories(Whoa
     PRIVATE
diff --git a/src/app/win/Whoa.rc b/src/app/win/Whoa.rc
index 0e59bac..feaf5a9 100644
--- a/src/app/win/Whoa.rc
+++ b/src/app/win/Whoa.rc
@@ -1,6 +1,6 @@
 #pragma code_page(65001) // UTF-8
 
-#ifdef _DEBUG
+#ifdef WHOA_APP_DEBUG
 BlizzardIcon.ico ICON DISCARDABLE "debug/Whoa.ico"
 #else
 BlizzardIcon.ico ICON DISCARDABLE "release/Whoa.ico"