diff --git a/esphome/components/mcp23s17/mcp23s17.cpp b/esphome/components/mcp23s17/mcp23s17.cpp
index 2fc9c74634..ca4c28e0b4 100644
--- a/esphome/components/mcp23s17/mcp23s17.cpp
+++ b/esphome/components/mcp23s17/mcp23s17.cpp
@@ -23,6 +23,13 @@ void MCP23S17::setup() {
   this->transfer_byte(0b00011000);  // Enable HAEN pins for addressing
   this->disable();
 
+  this->enable();
+  cmd = 0b01001000;
+  this->transfer_byte(cmd);
+  this->transfer_byte(mcp23x17_base::MCP23X17_IOCONA);
+  this->transfer_byte(0b00011000);  // Enable HAEN pins for addressing
+  this->disable();
+
   // Read current output register state
   this->read_reg(mcp23x17_base::MCP23X17_OLATA, &this->olat_a_);
   this->read_reg(mcp23x17_base::MCP23X17_OLATB, &this->olat_b_);