diff --git a/tests/qtest/libqos/ahci.c b/tests/qtest/libqos/ahci.c
index a2c94c6..6d59c75 100644
--- a/tests/qtest/libqos/ahci.c
+++ b/tests/qtest/libqos/ahci.c
@@ -662,7 +662,7 @@
     g_assert_not_reached();
 }
 
-inline unsigned size_to_prdtl(unsigned bytes, unsigned bytes_per_prd)
+static unsigned size_to_prdtl(unsigned bytes, unsigned bytes_per_prd)
 {
     /* Each PRD can describe up to 4MiB */
     g_assert_cmphex(bytes_per_prd, <=, 4096 * 1024);
diff --git a/tests/qtest/libqos/ahci.h b/tests/qtest/libqos/ahci.h
index 4801786..a0487a1 100644
--- a/tests/qtest/libqos/ahci.h
+++ b/tests/qtest/libqos/ahci.h
@@ -599,7 +599,6 @@
 
 /* Misc */
 bool is_atapi(AHCIQState *ahci, uint8_t port);
-unsigned size_to_prdtl(unsigned bytes, unsigned bytes_per_prd);
 
 /* Command: Macro level execution */
 void ahci_guest_io(AHCIQState *ahci, uint8_t port, uint8_t ide_cmd,