diff --git a/c_emulator/riscv_sim.c b/c_emulator/riscv_sim.c
index 5ad83e95b..9a37c18e1 100644
--- a/c_emulator/riscv_sim.c
+++ b/c_emulator/riscv_sim.c
@@ -233,7 +233,7 @@ char *process_args(int argc, char **argv)
                     "b:"
                     "t:"
                     "T:"
-                    "g"
+                    "g:"
                     "h"
 #ifdef RVFI_DII
                     "r:"