diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_lex.l b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_lex.l
index 925f8a5875e9..192e1e20d82c 100644
--- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_lex.l
+++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_lex.l
@@ -743,6 +743,7 @@ yyinit(dt_pcb_t *pcb)
 #ifdef illumos
 	yysptr = yysbuf;
 #endif
+	YY_FLUSH_BUFFER;
 }
 
 /*