diff --git a/pkgs/by-name/pe/petsc/package.nix b/pkgs/by-name/pe/petsc/package.nix
index d394c69ce2c4..8370e794681f 100644
--- a/pkgs/by-name/pe/petsc/package.nix
+++ b/pkgs/by-name/pe/petsc/package.nix
@@ -161,8 +161,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   configureFlags =
     [
-      "--with-blas=1"
-      "--with-lapack=1"
+      "--with-blaslapack=1"
       "--with-scalar-type=${scalarType}"
       "--with-precision=${precision}"
       "--with-mpi=${if mpiSupport then "1" else "0"}"