diff --git a/src/include/winpty.h b/src/include/winpty.h
index 562128f..ae68526 100644
--- a/src/include/winpty.h
+++ b/src/include/winpty.h
@@ -94,15 +94,13 @@ winpty_config_new(UINT64 agentFlags, winpty_error_ptr_t *err /*OPTIONAL*/);
 /* Free the cfg object after passing it to winpty_open. */
 WINPTY_API void winpty_config_free(winpty_config_t *cfg);
 
-WINPTY_API BOOL
-winpty_config_set_initial_size(winpty_config_t *cfg, int cols, int rows,
-                               winpty_error_ptr_t *err /*OPTIONAL*/);
+WINPTY_API void
+winpty_config_set_initial_size(winpty_config_t *cfg, int cols, int rows);
 
 /* Amount of time to wait for the agent to startup and to wait for any given
  * agent RPC request.  Must be greater than 0.  Can be INFINITE. */
-WINPTY_API BOOL
-winpty_config_set_agent_timeout(winpty_config_t *cfg, DWORD timeoutMs,
-                                winpty_error_ptr_t *err /*OPTIONAL*/);
+WINPTY_API void
+winpty_config_set_agent_timeout(winpty_config_t *cfg, DWORD timeoutMs);
 
 
 
diff --git a/src/libwinpty/winpty.cc b/src/libwinpty/winpty.cc
index f89ca27..4f4f178 100644
--- a/src/libwinpty/winpty.cc
+++ b/src/libwinpty/winpty.cc
@@ -165,25 +165,17 @@ WINPTY_API void winpty_config_free(winpty_config_t *cfg) {
     delete cfg;
 }
 
-WINPTY_API BOOL
-winpty_config_set_initial_size(winpty_config_t *cfg, int cols, int rows,
-                               winpty_error_ptr_t *err /*OPTIONAL*/) {
-    API_TRY {
-        ASSERT(cfg != nullptr && cols > 0 && rows > 0);
-        cfg->cols = cols;
-        cfg->rows = rows;
-        return TRUE;
-    } API_CATCH(FALSE);
+WINPTY_API void
+winpty_config_set_initial_size(winpty_config_t *cfg, int cols, int rows) {
+    ASSERT(cfg != nullptr && cols > 0 && rows > 0);
+    cfg->cols = cols;
+    cfg->rows = rows;
 }
 
-WINPTY_API BOOL
-winpty_config_set_agent_timeout(winpty_config_t *cfg, DWORD timeoutMs,
-                                winpty_error_ptr_t *err /*OPTIONAL*/) {
-    API_TRY {
-        ASSERT(cfg != nullptr && timeoutMs > 0);
-        cfg->timeoutMs = timeoutMs;
-        return TRUE;
-    } API_CATCH(FALSE)
+WINPTY_API void
+winpty_config_set_agent_timeout(winpty_config_t *cfg, DWORD timeoutMs) {
+    ASSERT(cfg != nullptr && timeoutMs > 0);
+    cfg->timeoutMs = timeoutMs;
 }
 
 
diff --git a/src/unix-adapter/main.cc b/src/unix-adapter/main.cc
index e7cf4f6..b90da65 100644
--- a/src/unix-adapter/main.cc
+++ b/src/unix-adapter/main.cc
@@ -438,7 +438,7 @@ int main(int argc, char *argv[])
 
     winpty_config_t *agentCfg = winpty_config_new(0, NULL);
     assert(agentCfg != NULL);
-    winpty_config_set_initial_size(agentCfg, sz.ws_col, sz.ws_row, NULL);
+    winpty_config_set_initial_size(agentCfg, sz.ws_col, sz.ws_row);
 
     winpty_error_ptr_t openErr = NULL;
     winpty_t *wp = winpty_open(agentCfg, &openErr);