diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a099a0c9dedcbfd11fa088accdeba1a940b54e91..40e74430867a295e19d0445c15db9a06e6fc8a1c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -47,19 +47,19 @@ building_stage:
       - cat /etc/os-release
       - cd src
       - echo "Running make with gnu compilers version 11..."
-      - make clean && BUILDDIR=$PWD/../build_gnu11 CXX=g++-11 FC=gfortran-11 make -j
+      - make clean && BUILDDIR=$PWD/../build_gnu11 CXX=g++-11 FC=gfortran-11 make
       - echo "Running make with gnu compilers version 12..."
-      - make clean && BUILDDIR=$PWD/../build_gnu12 CXX=g++-12 FC=gfortran-12 make -j
+      - make clean && BUILDDIR=$PWD/../build_gnu12 CXX=g++-12 FC=gfortran-12 make
       - echo "Running make with gnu fortran version 12 and clang version 13..."
-      - make clean && BUILDDIR=$PWD/../build_clang13 CXX="clang++-13 -stdlib=libc++" FC=gfortran-12 make -j
+      - make clean && BUILDDIR=$PWD/../build_clang13 CXX="clang++-13 -stdlib=libc++" FC=gfortran-12 make
       - echo "Running make with gnu fortran version 12 and clang version 14..."
-      - make clean && BUILDDIR=$PWD/../build_clang14 CXX="clang++-14 -stdlib=libc++" FC=gfortran-12 make -j
+      - make clean && BUILDDIR=$PWD/../build_clang14 CXX="clang++-14 -stdlib=libc++" FC=gfortran-12 make
       - echo "Running make with gnu fortran version 12 and clang version 15..."
-      - make clean && BUILDDIR=$PWD/../build_clang15 CXX="clang++-15 -stdlib=libc++" FC=gfortran-12 make -j
+      - make clean && BUILDDIR=$PWD/../build_clang15 CXX="clang++-15 -stdlib=libc++" FC=gfortran-12 make
       - echo "Running make with gnu fortran version 12 and clang version 16..."
-      - make clean && BUILDDIR=$PWD/../build_clang16 CXX="clang++-16 -stdlib=libc++" FC=gfortran-12 make -j
+      - make clean && BUILDDIR=$PWD/../build_clang16 CXX="clang++-16 -stdlib=libc++" FC=gfortran-12 make
       - echo "Finally running make with default compilers..."
-      - make clean && make -j
+      - make clean && make
       - make docs -j && make -C ../doc/build/latex -j
 
 running_stage:
diff --git a/src/testing/Makefile b/src/testing/Makefile
index 0db4a00fa2724d266c2b90a821eecfd6b9bb552b..9fff52e89e5c018b9aca391a6e736461ba389d00 100644
--- a/src/testing/Makefile
+++ b/src/testing/Makefile
@@ -15,7 +15,7 @@ CXX_TEDF_OBJS=$(OBJDIR)/test_TEDF.o $(OBJDIR)/Configuration.o $(OBJDIR)/file_io.
 
 CXX_TTMS_OBJS=$(OBJDIR)/test_TTMS.o $(OBJDIR)/file_io.o $(OBJDIR)/Parsers.o $(OBJDIR)/TransitionMatrix.o
 
-all: #$(BUILDDIR_TEST)/test_TEDF $(BUILDDIR_TEST)/test_TTMS
+all: $(BUILDDIR_TEST)/test_TEDF $(BUILDDIR_TEST)/test_TTMS
 
 $(BUILDDIR_TEST):
 	mkdir -p $(BUILDDIR_TEST)