diff --git a/theorie-graphes/Makefile b/theorie-graphes/Makefile
index 9aaf992..faa04b3 100644
--- a/theorie-graphes/Makefile
+++ b/theorie-graphes/Makefile
@@ -8,7 +8,7 @@ exercice: exercice.tex
 	@if ! cmp --silent build/exercice.pdf exercice_*.pdf; then \
 		touch exercice_tmp.pdf; \
 		rm exercice*.pdf; \
-		cp build/main.pdf exercice_${timestamp}.pdf; \
+		cp build/exercice.pdf exercice_${timestamp}.pdf; \
 		echo "Updated"; \
 	fi