diff --git a/petsc.spec b/petsc.spec
index 3597d02..c99d2f6 100644
--- a/petsc.spec
+++ b/petsc.spec
@@ -164,7 +164,7 @@ BuildRequires: lapack-devel
 BuildRequires: gcc, gcc-c++, cmake3
 BuildRequires: gcc-gfortran
 BuildRequires: libX11-devel
-BuildRequires: python2-devel, python2-sphinx
+BuildRequires: python2-devel, python3-sphinx
 BuildRequires: pcre-devel
 %if 0%{?rhel}
 BuildRequires: pkgconfig