diff --git a/sys/contrib/dev/acpica/include/acoutput.h b/sys/contrib/dev/acpica/include/acoutput.h
index 634cb60bce79..4fb718208c6e 100644
--- a/sys/contrib/dev/acpica/include/acoutput.h
+++ b/sys/contrib/dev/acpica/include/acoutput.h
@@ -489,6 +489,7 @@
 #define return_VOID                     return
 #define return_ACPI_STATUS(s)           return(s)
 #define return_PTR(s)                   return(s)
+#define return_STR(s)                   return(s)
 #define return_VALUE(s)                 return(s)
 #define return_UINT8(s)                 return(s)
 #define return_UINT32(s)                return(s)