diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0c0b12c8fd34095e24b6747500d044c54718cee6..72a4f3a7f1e7226e0423d93fbb36b99d6268503d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -42,12 +42,14 @@ before_script:
 
 build_only:
   script:
+    - cd slides
     - make
     - make deploy
     - rsync -avz prog_seq_c_cours ur1bg_malas@ur1bg.ftp.infomaniak.com:web/malaspinas/
 
 build_artifacts:
   script:
+    - cd slides
     - make
   artifacts:
     paths:
diff --git a/slides/Makefile b/slides/Makefile
index 277d6bb976ff4c4766b67cd8a686ff67bd31ed2a..fae0b190aeb06fa75e2c3395d391eb6e04adb000 100644
--- a/slides/Makefile
+++ b/slides/Makefile
@@ -16,7 +16,9 @@ HTML=$(MD:%.md=%.html)
 PDF=$(MD:%.md=%.pdf)
 MARKDOWN=$(MD:%.md=%.markdown)
 
-all: $(MARKDOWN)
+all: $(PDF) $(HTML)
+
+markdown: $(MARKDOWN)
 
 %.pdf: %.md metadata.yaml
 	pandoc -s $(OPTIONS) $(PDFOPTIONS) -o $@ $^
@@ -26,7 +28,10 @@ all: $(MARKDOWN)
 
 %.markdown: %.md metadata.yaml
 	echo "---" >> $@
-	sed '1 { /^---/ { :a N; /\n---/! ba; d} }' $< > only_header && grep -v -F -x -f  only_header $< > header.yaml && ./yq_linux_amd64 merge metadata.yaml header.yaml > $@
+	sed '1 { /^---/ { :a N; /\n---/! ba; d} }' $< > only_header
+	grep -v -F -x -f  only_header $< > header.yaml
+	./yq_linux_amd64 merge metadata.yaml header.yaml > $@
+	rm only_header header.yaml