diff --git a/gemmini/gemmini.cc b/gemmini/gemmini.cc
index ebd977cf..39dc8fee 100644
--- a/gemmini/gemmini.cc
+++ b/gemmini/gemmini.cc
@@ -1211,6 +1211,8 @@ reg_t gemmini_t::CUSTOMFN(XCUSTOM_ACC)(rocc_insn_t insn, reg_t xs1, reg_t xs2) {
   //==========================================================================
   else if (insn.funct == flush_funct) {
     dprintf("GEMMINI: flush\n");
+  } else if (insn.funct == fence_funct) {
+    dprintf("GEMMINI: fence\n");
   } else {
     dprintf("GEMMINI: encountered unknown instruction with funct: %d\n", insn.funct);
     illegal_instruction();
diff --git a/gemmini/gemmini.h b/gemmini/gemmini.h
index 68a5c68a..963846ad 100644
--- a/gemmini/gemmini.h
+++ b/gemmini/gemmini.h
@@ -136,6 +136,7 @@ class gemmini_t : public rocc_t
   const unsigned loop_ws_config_addrs_DC_funct = 11;
   const unsigned loop_ws_config_strides_AB_funct = 12;
   const unsigned loop_ws_config_strides_DC_funct = 13;
+
   const unsigned loop_conv_ws_funct = 15;
   const unsigned loop_conv_ws_config_1_funct = 16;
   const unsigned loop_conv_ws_config_2_funct = 17;
@@ -144,6 +145,8 @@ class gemmini_t : public rocc_t
   const unsigned loop_conv_ws_config_5_funct = 20;
   const unsigned loop_conv_ws_config_6_funct = 21;
 
+  const unsigned fence_funct = 127;
+
   //==========================================================================
   // gemmini-cisc opcodes
   //==========================================================================