diff --git a/code/OpenGEXImporter.cpp b/code/OpenGEXImporter.cpp
index 1f46e47e2..f81f98a6e 100644
--- a/code/OpenGEXImporter.cpp
+++ b/code/OpenGEXImporter.cpp
@@ -45,6 +45,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <openddlparser/OpenDDLParser.h>
 #include <assimp/scene.h>
+#include <assimp/ai_assert.h>
 
 #include <vector>