diff --git a/build-fastcompile.sh b/build-fastcompile.sh
index 2b5d1c6fc..510a91e18 100755
--- a/build-fastcompile.sh
+++ b/build-fastcompile.sh
@@ -6,7 +6,8 @@ if [ -f CMakeLists.txt ]; then
 fi
 
 if ! [ -f CMakeCache.txt ]; then
-	cmake -DCMAKE_BUILD_TYPE=Release -DUNITY_BUILDS=OFF -DWHOLE_PROGRAM_OPTIMISATION=OFF ..
+	# Unity builds do speed things up as less small files requiring a full compiler startup and cleanup for each.
+	cmake -DCMAKE_BUILD_TYPE=Release -DUNITY_BUILDS=ON -DWHOLE_PROGRAM_OPTIMISATION=OFF ..
 fi
 
 make -j$(nproc)