diff --git a/customext/cflush.cc b/customext/cflush.cc
index 640c29fc..8b72a97d 100644
--- a/customext/cflush.cc
+++ b/customext/cflush.cc
@@ -24,9 +24,9 @@ class cflush_t : public extension_t
 
   std::vector<insn_desc_t> get_instructions() {
     std::vector<insn_desc_t> insns;
-    insns.push_back((insn_desc_t){0xFC000073, 0xFFF07FFF, custom_cflush, custom_cflush});
-    insns.push_back((insn_desc_t){0xFC200073, 0xFFF07FFF, custom_cflush, custom_cflush});
-    insns.push_back((insn_desc_t){0xFC100073, 0xFFF07FFF, custom_cflush, custom_cflush});
+    insns.push_back((insn_desc_t){0xFC000073, 0xFFF07FFF, custom_cflush, custom_cflush, custom_cflush, custom_cflush});
+    insns.push_back((insn_desc_t){0xFC200073, 0xFFF07FFF, custom_cflush, custom_cflush, custom_cflush, custom_cflush});
+    insns.push_back((insn_desc_t){0xFC100073, 0xFFF07FFF, custom_cflush, custom_cflush, custom_cflush, custom_cflush});
     return insns;
   }
 
diff --git a/riscv/rocc.cc b/riscv/rocc.cc
index db03e37c..f50934f0 100644
--- a/riscv/rocc.cc
+++ b/riscv/rocc.cc
@@ -32,10 +32,10 @@ customX(3)
 std::vector<insn_desc_t> rocc_t::get_instructions()
 {
   std::vector<insn_desc_t> insns;
-  insns.push_back((insn_desc_t){0x0b, 0x7f, &::illegal_instruction, c0});
-  insns.push_back((insn_desc_t){0x2b, 0x7f, &::illegal_instruction, c1});
-  insns.push_back((insn_desc_t){0x5b, 0x7f, &::illegal_instruction, c2});
-  insns.push_back((insn_desc_t){0x7b, 0x7f, &::illegal_instruction, c3});
+  insns.push_back((insn_desc_t){0x0b, 0x7f, &::illegal_instruction, c0, &::illegal_instruction, c0});
+  insns.push_back((insn_desc_t){0x2b, 0x7f, &::illegal_instruction, c1, &::illegal_instruction, c1});
+  insns.push_back((insn_desc_t){0x5b, 0x7f, &::illegal_instruction, c2, &::illegal_instruction, c2});
+  insns.push_back((insn_desc_t){0x7b, 0x7f, &::illegal_instruction, c3, &::illegal_instruction, c3});
   return insns;
 }