diff --git a/CMakeLists.txt b/CMakeLists.txt
index 63c153df9..091ab2d3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,8 +41,8 @@ SET(CMAKE_POLICY_DEFAULT_CMP0092 NEW)
 CMAKE_MINIMUM_REQUIRED( VERSION 3.10 )
 
 # Disabled importers: m3d for 5.1
-ADD_DEFINITIONS ( -DASSIMP_BUILD_NO_M3D_IMPORTER )
-
+ADD_DEFINITIONS( -DASSIMP_BUILD_NO_M3D_IMPORTER)
+ADD_DEFINITIONS( -DASSIMP_BUILD_NO_M3D_EXPORTER)
 # Toggles the use of the hunter package manager
 option(ASSIMP_HUNTER_ENABLED "Enable Hunter package manager support" OFF)