diff -up inventor/lib/database/src/so/SoOutput.c++.s390x inventor/lib/database/src/so/SoOutput.c++
--- inventor/lib/database/src/so/SoOutput.c++.s390x	2009-04-22 23:09:59.000000000 +0200
+++ inventor/lib/database/src/so/SoOutput.c++	2009-04-22 23:09:25.000000000 +0200
@@ -1462,7 +1462,7 @@ SoOutput::findReference(const SoBase *ba
 
     // Generates a CC warning. Ho hum.
     if (refDict->find((unsigned long) base, ref))
-#if (_MIPS_SZPTR == 64 || __ia64__ || __x86_64__ || __powerpc64__)
+#if (_MIPS_SZPTR == 64 || __ia64__ || __x86_64__ || __powerpc64__ || __s390x__)
         referenceId = (int) ((unsigned long) ref);
 #else
 	referenceId = (int)ref;