diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 84a1e902ace668fbee40346cf71e3c4c7a519f2e..b31345be95891932fa8d1ad2d5b1334d156f30e1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -66,7 +66,7 @@ build_win10_mingw:
     - mkdir debug
     - cd debug
     - cmake --no-warn-unused-cli -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE -DCMAKE_BUILD_TYPE:STRING=Debug -DCMAKE_C_COMPILER:FILEPATH=C:\msys64\mingw64\bin\x86_64-w64-mingw32-gcc.exe -DCMAKE_CXX_COMPILER:FILEPATH=C:\msys64\mingw64\bin\x86_64-w64-mingw32-g++.exe .. -G "Unix Makefiles"
-    - cmake --build . -j 8
+    - cmake --build . -j 4
 
 build_mac_clang:
   only: