diff --git a/sw/airborne/arch/stm32/mcu_periph/spi_arch.c b/sw/airborne/arch/stm32/mcu_periph/spi_arch.c
index 834198e51a..34ed8e916b 100644
--- a/sw/airborne/arch/stm32/mcu_periph/spi_arch.c
+++ b/sw/airborne/arch/stm32/mcu_periph/spi_arch.c
@@ -1341,7 +1341,7 @@ void spi2_slave_arch_init(void) {
 
   // set the default configuration
   set_default_comm_config(&spi2_dma.comm);
-  spi1_dma.comm_sig = get_comm_signature(&spi2_dma.comm);
+  spi2_dma.comm_sig = get_comm_signature(&spi2_dma.comm);
 
   // set init struct, indices and status
   spi2.reg_addr = (void *)SPI2;