diff --git a/.ci/compile.sh b/.ci/compile.sh
index 8ccf5622b..e8e71c738 100755
--- a/.ci/compile.sh
+++ b/.ci/compile.sh
@@ -128,9 +128,11 @@ if [[ $MAKE_TEST ]]; then
   flags+=("-DTEST=1")
 fi
 if [[ $USE_CCACHE ]]; then
-  flags+=("-DUSE_CCACHE=1")
   if [[ $CCACHE_VARIANT ]]; then
-    flags+=("-DCMAKE_C_COMPILER_LAUNCHER=$CCACHE_VARIANT" "-DCMAKE_CXX_COMPILER_LAUNCHER=$CCACHE_VARIANT")
+    # COMPILER_LAUNCHER only; USE_CCACHE=OFF prevents RULE_LAUNCH_COMPILE (avoids Strawberry ccache on Windows)
+    flags+=("-DUSE_CCACHE=OFF" "-DCMAKE_C_COMPILER_LAUNCHER=$CCACHE_VARIANT" "-DCMAKE_CXX_COMPILER_LAUNCHER=$CCACHE_VARIANT")
+  else
+    flags+=("-DUSE_CCACHE=1")
   fi
   if [[ $CCACHE_SIZE && "$CCACHE_VARIANT" != "sccache" ]]; then
     # note, this setting persists after running the script
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa9ea75f7..5454469ee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -144,7 +144,8 @@ endif()
 # Define proper compilation flags
 if(MSVC)
   # Disable Warning C4251, C++20 compatibility, Multi-threaded Builds, Warn Detection, Unwind Semantics, Debug Symbols
-  set(CMAKE_CXX_FLAGS "/wd4251 /Zc:__cplusplus /std:c++20 /permissive- /W4 /MP /EHsc /Zi")
+  # /FS: Allow concurrent PDB writes (required for Ninja + /MP parallel builds)
+  set(CMAKE_CXX_FLAGS "/wd4251 /Zc:__cplusplus /std:c++20 /permissive- /W4 /MP /EHsc /Zi /FS")
   # Visual Studio: Maximum Optimization, Multi-threaded DLL
   set(CMAKE_CXX_FLAGS_RELEASE "/Ox /MD")
   # Visual Studio: No Optimization, Multi-threaded Debug DLL
diff --git a/cockatrice/src/main.cpp b/cockatrice/src/main.cpp
index 02b06147e..7092a3fd7 100644
--- a/cockatrice/src/main.cpp
+++ b/cockatrice/src/main.cpp
@@ -214,7 +214,6 @@ int main(int argc, char *argv[])
 #endif
 
 #ifdef Q_OS_MAC
-
     translationPath = qApp->applicationDirPath() + "/../Resources/translations";
 #elif defined(Q_OS_WIN)
     translationPath = qApp->applicationDirPath() + "/translations";
@@ -238,7 +237,6 @@ int main(int argc, char *argv[])
     }
 
     rng = new RNG_SFMT;
-    const auto bla = 42;
     themeManager = new ThemeManager;
     soundEngine = new SoundEngine;