--- a/db/sqlite3/src/Makefile.in
+++ b/db/sqlite3/src/Makefile.in
@@ -111,16 +111,21 @@ ifeq ($(MOZ_WIDGET_TOOLKIT),cocoa)
 DEFINES += -DSQLITE_ENABLE_LOCKING_STYLE=1
 endif
 
 # Turn on SQLite's assertions in debug builds.
 ifdef MOZ_DEBUG
 DEFINES += -DSQLITE_DEBUG=1
 endif
 
+# disable PGO for Sun Studio
+ifdef SOLARIS_SUNPRO_CC
+NO_PROFILE_GUIDED_OPTIMIZE = 1
+endif
+
 ifeq ($(OS_ARCH),OS2)
 ifdef MOZ_OS2_HIGH_MEMORY
 DEFINES += -DOS2_HIGH_MEMORY
 endif
 endif
 
 include $(topsrcdir)/config/rules.mk