diff --git a/krylov/CMakeLists.txt b/krylov/CMakeLists.txt
index 5e93f55dca723346dec328fed18ebddb316b8a82..97a1ee8bf7daaccfb1b1827b6fb949a6fb074651 100644
--- a/krylov/CMakeLists.txt
+++ b/krylov/CMakeLists.txt
@@ -31,7 +31,7 @@ set(NAMEC ${DWARF_PREFIX}_krylov_multirhs)
 # C++ compiler settings
 
 find_package(Common)
-find_package(PETSc REQUIRED)
+find_package(PETSc)
 find_package(MPI)
 
 select_compiler_flags(cxx_flags