diff --git a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
--- a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
@@ -2431,6 +2431,10 @@
 extern int dtrace_instr_size(uint8_t *instr);
 #endif
 
+#if defined(__i386) || defined(__amd64)
+extern int dtrace_dis_get_byte(void *p);
+#endif
+
 #endif	/* _ASM */
 
 #if defined(__i386) || defined(__amd64)
diff --git a/sys/cddl/dev/dtrace/x86/instr_size.c b/sys/cddl/dev/dtrace/x86/instr_size.c
--- a/sys/cddl/dev/dtrace/x86/instr_size.c
+++ b/sys/cddl/dev/dtrace/x86/instr_size.c
@@ -49,6 +49,7 @@
 
 typedef	u_int			model_t;
 #define	DATAMODEL_NATIVE	0
+int dtrace_dis_get_byte(void *);
 int dtrace_instr_size(uint8_t *);
 int dtrace_instr_size_isa(uint8_t *, model_t, int *);
 #endif
@@ -79,7 +80,7 @@
 /*
  * get a byte from instruction stream
  */
-static int
+int
 dtrace_dis_get_byte(void *p)
 {
 	int ret;