diff --git a/CMakeLists.txt b/CMakeLists.txt
index f758852ebe..37eddc18df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,6 +46,14 @@ endif (${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
 
 # ================================================================================
 
+# Needed for boost1.69
+# Avoid that Python (pyerrors.h) defines snprintf and vsnprintf
+if (MSVC AND NOT MSVC_VERSION VERSION_LESS 1900)
+    add_definitions(-DHAVE_SNPRINTF)
+elseif (MINGW)
+    add_definitions(-DHAVE_SNPRINTF)
+endif()
+
 # Allow developers to use Boost < 1.48
 if (NOT BOOST_MIN_VERSION)
     set(BOOST_MIN_VERSION 1.48)