diff --git a/make/solaris/makefiles/fastdebug.make b/make/solaris/makefiles/fastdebug.make
index 62eaeb8f9688244e25cd58bf39938fc4c3833bf0..3ac2ae212b197c60c2dd65e3495808dfd8e6f7e8 100644
--- a/make/solaris/makefiles/fastdebug.make
+++ b/make/solaris/makefiles/fastdebug.make
@@ -38,6 +38,8 @@ OPT_CFLAGS/SLOWER = -xO2
 
 # Problem with SS12 compiler, dtrace doesn't like the .o files  (bug 6693876)
 ifeq ($(COMPILER_REV), 5.9)
+  # To avoid jvm98 crash
+  OPT_CFLAGS/instanceKlass.o = $(OPT_CFLAGS/SLOWER)
   # Not clear this workaround could be skipped in some cases.
   OPT_CFLAGS/vmGCOperations.o = $(OPT_CFLAGS/SLOWER)
   OPT_CFLAGS/java.o = $(OPT_CFLAGS/SLOWER)