diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12755e50..f387bb8c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,10 @@
 if(COMMAND cmake_policy)
     cmake_policy(SET CMP0003 NEW) # link to full path of libs
     cmake_policy(SET CMP0005 NEW) # escapes in add_definitions
-    cmake_policy(SET CMP0077 NEW) # use vars for options
+
+    if(POLICY CMP0077)
+        cmake_policy(SET CMP0077 NEW) # use vars for options
+    endif()
 
     if(NOT CMAKE_VERSION VERSION_LESS 3.0)
         cmake_policy(SET CMP0043 NEW) # for wxWidgets, use generator expressions
diff --git a/src/wx/CMakeLists.txt b/src/wx/CMakeLists.txt
index 9befa5c1..94abc54a 100644
--- a/src/wx/CMakeLists.txt
+++ b/src/wx/CMakeLists.txt
@@ -3,7 +3,10 @@
 if(COMMAND cmake_policy)
     cmake_policy(SET CMP0003 NEW) # link to full path of libs
     cmake_policy(SET CMP0005 NEW) # escapes in add_definitions
-    cmake_policy(SET CMP0077 NEW) # use vars for options
+
+    if(POLICY CMP0077)
+        cmake_policy(SET CMP0077 NEW) # use vars for options
+    endif()
 
     if(NOT CMAKE_VERSION VERSION_LESS 3.0)
         cmake_policy(SET CMP0043 NEW) # for wxWidgets, use generator expressions