diff --git a/chap8p1.sh b/chap8p1.sh
index 0c9ad06..69b057b 100644
--- a/chap8p1.sh
+++ b/chap8p1.sh
@@ -363,7 +363,7 @@ echo "Finished 8.20 ""$LFS_MPFR""" >> build.log &&
 echo "$LFS_MPFR" >> /installed.txt
 
 echo "8.21 ""$LFS_MPC"""
-tar xf "$LFS_MPC".tar,gz &&
+tar xf "$LFS_MPC".tar.gz &&
 cd "$LFS_MPC" &&
 ./configure --prefix=/usr    \
             --disable-static \