diff --git a/hw/ssi/imx_spi.c b/hw/ssi/imx_spi.c
index 2dd9a631e1..6fef5c7958 100644
--- a/hw/ssi/imx_spi.c
+++ b/hw/ssi/imx_spi.c
@@ -182,7 +182,7 @@ static void imx_spi_flush_txfifo(IMXSPIState *s)
 
         rx = 0;
 
-        while (tx_burst) {
+        while (tx_burst > 0) {
             uint8_t byte = tx & 0xff;
 
             DPRINTF("writing 0x%02x\n", (uint32_t)byte);