diff --git a/Utilities/cmliblzma/liblzma/lzma/lzma_encoder_optimum_normal.c b/Utilities/cmliblzma/liblzma/lzma/lzma_encoder_optimum_normal.c
index d3a63485c..fc54d8d31 100644
--- a/Utilities/cmliblzma/liblzma/lzma/lzma_encoder_optimum_normal.c
+++ b/Utilities/cmliblzma/liblzma/lzma/lzma_encoder_optimum_normal.c
@@ -8,6 +8,9 @@
 //  You can do whatever you want with this file.
 //
 ///////////////////////////////////////////////////////////////////////////////
+#if defined(__IBMC__)
+# pragma options optimize=0
+#endif
 
 #include "lzma_encoder_private.h"
 #include "fastpos.h"