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diff --git a/cddl/lib/libdtrace/Makefile b/cddl/lib/libdtrace/Makefile
--- a/cddl/lib/libdtrace/Makefile
+++ b/cddl/lib/libdtrace/Makefile
@@ -122,10 +122,14 @@
.endif
.if ${MACHINE_ARCH} == "i386" || ${MACHINE_ARCH} == "amd64"
-SRCS+= dis_tables.c
+SRCS+= dis_tables.c instr_size.c
DSRCS+= regs_x86.d
.endif
+.if ${MACHINE_CPUARCH} == "riscv"
+SRCS+= instr_size.c
+.endif
+
YFLAGS+=-d
LIBADD= ctf dwarf elf proc pthread rtld_db
diff --git a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
--- a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
@@ -51,6 +51,8 @@
#include <sys/param.h>
#include <sys/stdint.h>
+#include <sys/types.h>
+
#ifdef _KERNEL
#include <sys/endian.h>
#endif
@@ -71,7 +73,6 @@
#include <sys/ioccom.h>
#include <sys/cred.h>
#include <sys/proc.h>
-#include <sys/types.h>
#include <sys/ucred.h>
#endif
typedef int model_t;
@@ -2399,7 +2400,6 @@
extern int dtrace_mach_aframes(void);
#if defined(__i386) || defined(__amd64)
-extern int dtrace_instr_size(uint8_t *instr);
extern int dtrace_instr_size_isa(uint8_t *, model_t, int *);
extern void dtrace_invop_callsite(void);
#endif
@@ -2428,6 +2428,10 @@
#endif /* _KERNEL */
+#if defined(__i386) || defined(__amd64) || defined (__riscv)
+extern int dtrace_instr_size(uint8_t *instr);
+#endif
+
#endif /* _ASM */
#if defined(__i386) || defined(__amd64)
diff --git a/sys/cddl/dev/dtrace/riscv/instr_size.c b/sys/cddl/dev/dtrace/riscv/instr_size.c
new file mode 100644
--- /dev/null
+++ b/sys/cddl/dev/dtrace/riscv/instr_size.c
@@ -0,0 +1,22 @@
+/*
+ * SPDX-License-Identifier: CDDL 1.0
+ *
+ * Copyright 2023 Christos Margiolis <christos@FreeBSD.org>
+ */
+
+#include <sys/types.h>
+#include <sys/dtrace.h>
+
+#include <machine/riscvreg.h>
+
+#define RVC_MASK 0x03
+
+int
+dtrace_instr_size(uint8_t *instr)
+{
+ /* Detect compressed instructions. */
+ if ((~(*instr) & RVC_MASK) == 0)
+ return (INSN_SIZE);
+ else
+ return (INSN_C_SIZE);
+}
diff --git a/sys/modules/dtrace/dtrace/Makefile b/sys/modules/dtrace/dtrace/Makefile
--- a/sys/modules/dtrace/dtrace/Makefile
+++ b/sys/modules/dtrace/dtrace/Makefile
@@ -23,6 +23,9 @@
CFLAGS+= -I${SYSDIR}/cddl/contrib/opensolaris/uts/intel \
-I${SYSDIR}/cddl/dev/dtrace/x86
+.endif
+.if ${MACHINE_CPUARCH} == "riscv"
+SRCS+= instr_size.c
.endif
CFLAGS+= ${OPENZFS_CFLAGS}

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