diff --git a/ext/openexr/gstopenexrdec.cpp b/ext/openexr/gstopenexrdec.cpp
index eeb316cb1..32b1d03c3 100644
--- a/ext/openexr/gstopenexrdec.cpp
+++ b/ext/openexr/gstopenexrdec.cpp
@@ -29,6 +29,7 @@
 
 #include <ImfRgbaFile.h>
 #include <ImfIO.h>
+#include <ImfInt64.h>
 using namespace Imf;
 using namespace Imath;