diff --git a/libs/xous-bio-bdma/src/bio_tests/units.rs b/libs/xous-bio-bdma/src/bio_tests/units.rs
index 840dad168..31673011d 100644
--- a/libs/xous-bio-bdma/src/bio_tests/units.rs
+++ b/libs/xous-bio-bdma/src/bio_tests/units.rs
@@ -403,7 +403,7 @@ pub fn host_fifo_tests() -> usize {
 bio_code!(fifo_host0_bitbang, FIFO_HOST0_BITBANG_START, FIFO_HOST0_BITBANG_END,
     "li    t0, 0xFFFFFFFF",
     "mv    x26, t0",         // ensure mask is disabled
-    "mv    x25, t0",         // set all pins to inputs
+    "mv    x24, t0",         // set all pins to outputs
     "90:",
     "mv x21, x16",
     "mv x20, zero",