diff --git a/quad10/fenomens/lab/p3/Makefile b/quad10/fenomens/lab/p3/Makefile
index 64bd220..d8a0c80 100644
--- a/quad10/fenomens/lab/p3/Makefile
+++ b/quad10/fenomens/lab/p3/Makefile
@@ -10,7 +10,7 @@
 	gfortran -c MC-2.f90
 	gfortran MC-2.o writeconfigseed.o mt19937ar.o magne.o energ.o str.o -o out/mc2
 mt19937ar.o: mt19937ar.f
-	f77 -c mt19937ar.f
+	gfortran -c mt19937ar.f
 writeconfig.o: writeconfig.f90
 	gfortran -c writeconfig.f90
 writeconfigseed.o: writeconfigseed.f90