diff --git a/configure.ac b/configure.ac
index 201983bd2349fcf20cf1b89165787d3a4cf168f5..a05f7b5372bd187118f588575346ea66717ba3a0 100755
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@ m4_ifdef([AX_LAPACK],,[m4_include([m4/ax_lapack.m4])])
 m4_ifdef([AX_SUITESPARSE],,[m4_include([m4/ax_suitesparse.m4])])
 m4_ifdef([AX_EIGEN],,[m4_include([m4/ax_eigen.m4])])
 m4_ifdef([AX_LIB_HDF5],,[m4_include([m4/ax_lib_hdf5.m4])])
-m4_ifdef([AX_PETSC_LIB],,[m4/ax_petsc_lib.m4])
+m4_ifdef([AX_LIB_PETSC],,[m4/ax_petsc_lib.m4])
 
 case $host_os in
    *cygwin*)
diff --git a/m4/ax_petsc_lib.m4 b/m4/ax_petsc_lib.m4
old mode 100644
new mode 100755