diff --git a/Makefile b/Makefile
index e8743fa0..2519e463 100644
--- a/Makefile
+++ b/Makefile
@@ -12,8 +12,8 @@ all: clean dirs
 
 %.pdf: 
 	@$(MAKE) -C `dirname $@`
-	@$(MAKE) clean -C `dirname $@`
 	cp $@ build/`dirname $@`.pdf
+	@$(MAKE) clean -C `dirname $@`
 
 dirs: $(TARGETS_DIRS)
 
diff --git a/build/module05.pdf b/build/module05.pdf
index 00beb1c4..c92150fb 100644
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diff --git a/build/module06.pdf b/build/module06.pdf
index 4ecea620..122a51af 100644
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diff --git a/build/module07.pdf b/build/module07.pdf
index 8c517ae9..5ae34062 100644
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diff --git a/build/module08.pdf b/build/module08.pdf
index 40c8c935..975d30f4 100644
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diff --git a/build/module09.pdf b/build/module09.pdf
index 10e520e9..6bc164a5 100644
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diff --git a/module05/en.subject.pdf b/module05/en.subject.pdf
index 00beb1c4..c92150fb 100644
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diff --git a/module06/en.subject.pdf b/module06/en.subject.pdf
index 4ecea620..122a51af 100644
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diff --git a/module07/en.subject.pdf b/module07/en.subject.pdf
index 8c517ae9..5ae34062 100644
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diff --git a/module08/en.subject.pdf b/module08/en.subject.pdf
index 40c8c935..975d30f4 100644
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diff --git a/module09/en.subject.pdf b/module09/en.subject.pdf
index 10e520e9..6bc164a5 100644
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