diff --git a/sys/contrib/dev/acpica/aecommon.h b/sys/contrib/dev/acpica/aecommon.h
index b9f4659e422..609e9907926 100644
--- a/sys/contrib/dev/acpica/aecommon.h
+++ b/sys/contrib/dev/acpica/aecommon.h
@@ -183,7 +183,7 @@ typedef union ptr_ovl
 #define OSD_PRINT(lvl,fp)               TEST_OUTPUT_LEVEL(lvl) {\
                                             AcpiOsPrintf PARAM_LIST(fp);}
 
-void __cdecl
+void
 AeCtrlCHandler (
     int                     Sig);
 
diff --git a/sys/contrib/dev/acpica/aeexec.c b/sys/contrib/dev/acpica/aeexec.c
index 899dead1396..12ba7b23e27 100644
--- a/sys/contrib/dev/acpica/aeexec.c
+++ b/sys/contrib/dev/acpica/aeexec.c
@@ -195,7 +195,7 @@ RSDT_DESCRIPTOR_REV1        *LocalRSDT;
  *
  *****************************************************************************/
 
-void __cdecl
+void
 AeCtrlCHandler (
     int                     Sig)
 {