diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff4f8853..fa3b07a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -177,6 +177,8 @@ if(MINGW)
   list(REMOVE_ITEM CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES ${DEFLIB})
 endif()
 
+set(ORIG_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
+
 if(STATIC)
   if(MSVC)
     set(CMAKE_FIND_LIBRARY_SUFFIXES .lib .dll.a .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index d13f67b9..70763caf 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -76,7 +76,11 @@ endif()
 find_package(Unbound)
 
 if(NOT UNBOUND_INCLUDE_DIR OR STATIC)
+  # We want unbound config tests to be independent of changes made to this setting.
+  set(CURRENT_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
+  set(CMAKE_FIND_LIBRARY_SUFFIXES ${ORIG_CMAKE_FIND_LIBRARY_SUFFIXES})
   add_subdirectory(unbound)
+  set(CMAKE_FIND_LIBRARY_SUFFIXES ${CURRENT_CMAKE_FIND_LIBRARY_SUFFIXES})
 
   set(UNBOUND_STATIC true PARENT_SCOPE)
   set(UNBOUND_INCLUDE "${CMAKE_CURRENT_SOURCE_DIR}/unbound/libunbound" PARENT_SCOPE)