diff --git a/.ci/compile.sh b/.ci/compile.sh
index 8a16d3243..bd8c900c8 100755
--- a/.ci/compile.sh
+++ b/.ci/compile.sh
@@ -149,6 +149,9 @@ if [[ $MAKE_TEST ]]; then
 fi
 if [[ $USE_CCACHE ]]; then
   flags+=("-DUSE_CCACHE=1")
+  # PCH-aware caching is required or ccache refuses to cache any TU that
+  # consumes a precompiled header, silently recompiling everything on every run.
+  ccache --set-config sloppiness=pch_defines,time_macros
   if [[ $CCACHE_SIZE ]]; then
     # note, this setting persists after running the script
     ccache --max-size "$CCACHE_SIZE"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 35eb8111b..7beb69409 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,6 +44,10 @@ if(USE_CCACHE)
   if(CCACHE_PROGRAM)
     # Support Unix Makefiles and Ninja
     set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_PROGRAM}")
+    # PCH-aware caching, matching .ci/compile.sh: without this ccache refuses
+    # to cache any TU that consumes a precompiled header, so every PCH-backed
+    # target recompiles from scratch on each build.
+    execute_process(COMMAND ${CCACHE_PROGRAM} --set-config sloppiness=pch_defines,time_macros)
     message(STATUS "Found CCache ${CCACHE_PROGRAM}")
   endif()
 endif()
diff --git a/cmake/pch/qtcore_pch.h b/cmake/pch/qtcore_pch.h
index 9954bc8b9..cc3dd12ee 100644
--- a/cmake/pch/qtcore_pch.h
+++ b/cmake/pch/qtcore_pch.h
@@ -21,4 +21,4 @@
 #include <QString>
 #include <QStringList>
 #include <QTimer>
-#include <QVariant>
\ No newline at end of file
+#include <QVariant>
diff --git a/format.sh b/format.sh
index ca3557ea7..9e3a6069b 100755
--- a/format.sh
+++ b/format.sh
@@ -18,6 +18,7 @@ include=("cockatrice/src" \
 libcockatrice_* \
 "oracle/src" \
 "servatrice/src" \
+"cmake/pch" \
 "tests")
 exclude=("libcockatrice_rng/libcockatrice/rng/sfmt/" \
 "libcockatrice_utility/libcockatrice/utility/peglib.h" \