diff --git a/src/ctrl/ctrl_core.c b/src/ctrl/ctrl_core.c
index 5c4b696a..d6c8df1c 100644
--- a/src/ctrl/ctrl_core.c
+++ b/src/ctrl/ctrl_core.c
@@ -1274,7 +1274,7 @@ ctrl_process_write(CTRL_MachineID machine_id, DMN_Handle process, Rng1U64 range,
 //- rjf: thread register cache reading
 
 internal void *
-ctrl_query_cached_reg_block_from_thread(Arena *arena, CTRL_MachineID machine_id, DMN_Handle thread, U64 endt_us)
+ctrl_query_cached_reg_block_from_thread(Arena *arena, CTRL_MachineID machine_id, DMN_Handle thread)
 {
   // TODO(rjf)
   return 0;
@@ -1332,7 +1332,7 @@ ctrl_unwind_from_thread(Arena *arena, CTRL_EntityStore *store, CTRL_MachineID ma
     case Architecture_x64:
     {
       // rjf: grab initial register block
-      void *regs_block = ctrl_query_cached_reg_block_from_thread(scratch.arena, machine_id, thread, endt_us);
+      void *regs_block = ctrl_query_cached_reg_block_from_thread(scratch.arena, machine_id, thread);
       
       // rjf: grab initial memory view
       B32 stack_memview_good = 0;
@@ -2989,7 +2989,7 @@ ctrl_thread__run(CTRL_Msg *msg)
       CTRL_Entity *thread = ctrl_entity_from_machine_id_handle(ctrl_state->ctrl_thread_entity_store, CTRL_MachineID_Local, event->thread);
       Architecture arch = thread->arch;
       U64 reg_size = regs_block_size_from_architecture(arch);
-      void *thread_regs_block = ctrl_query_cached_reg_block_from_thread(scratch.arena, CTRL_MachineID_Local, event->thread, max_U64);
+      void *thread_regs_block = ctrl_query_cached_reg_block_from_thread(scratch.arena, CTRL_MachineID_Local, event->thread);
       U64 thread_rip_vaddr = regs_rip_from_arch_block(arch, thread_regs_block);
       DMN_Handle module = {0};
       String8 module_name = {0};
diff --git a/src/ctrl/ctrl_core.h b/src/ctrl/ctrl_core.h
index b33c59d6..59c72af2 100644
--- a/src/ctrl/ctrl_core.h
+++ b/src/ctrl/ctrl_core.h
@@ -649,7 +649,7 @@ internal B32 ctrl_process_write(CTRL_MachineID machine_id, DMN_Handle process, R
 //~ rjf: Thread Register Functions
 
 //- rjf: thread register cache reading
-internal void *ctrl_query_cached_reg_block_from_thread(Arena *arena, CTRL_MachineID machine_id, DMN_Handle thread, U64 endt_us);
+internal void *ctrl_query_cached_reg_block_from_thread(Arena *arena, CTRL_MachineID machine_id, DMN_Handle thread);
 internal U64 ctrl_query_cached_tls_root_vaddr_from_thread(CTRL_MachineID machine_id, DMN_Handle thread);
 internal U64 ctrl_query_cached_rip_from_thread(CTRL_MachineID machine_id, DMN_Handle thread);
 internal U64 ctrl_query_cached_rsp_from_thread(CTRL_MachineID machine_id, DMN_Handle thread);
diff --git a/src/df/core/df_core.c b/src/df/core/df_core.c
index 61008dee..496fad24 100644
--- a/src/df/core/df_core.c
+++ b/src/df/core/df_core.c
@@ -3717,7 +3717,7 @@ internal B32
 df_set_thread_rip(DF_Entity *thread, U64 vaddr)
 {
   Temp scratch = scratch_begin(0, 0);
-  void *block = ctrl_query_cached_reg_block_from_thread(scratch.arena, thread->ctrl_machine_id, thread->ctrl_handle, max_U64);
+  void *block = ctrl_query_cached_reg_block_from_thread(scratch.arena, thread->ctrl_machine_id, thread->ctrl_handle);
   regs_arch_block_write_rip(thread->arch, block, vaddr);
   B32 result = ctrl_thread_write_reg_block(thread->ctrl_machine_id, thread->ctrl_handle, block);