diff --git a/hardware/msp430/libraries/SPI/utility/usi_spi.cpp b/hardware/msp430/libraries/SPI/utility/usi_spi.cpp
index a03fd6ae03f..845f8c964ea 100644
--- a/hardware/msp430/libraries/SPI/utility/usi_spi.cpp
+++ b/hardware/msp430/libraries/SPI/utility/usi_spi.cpp
@@ -62,6 +62,7 @@ void spi_initialize(void)
 
 void spi_disable(void) {
     USICTL0 |= USISWRST;        // put USI in reset mode
+    USICTL0 &= ~(USIPE5 | USIPE6 | USIPE7);
 }
 
 /**