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-rw-r--r--include/acpi/platform/acenv.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/acpi/platform/acenv.h b/include/acpi/platform/acenv.h
index e62f10d9a7d8..fa7689a6fc4b 100644
--- a/include/acpi/platform/acenv.h
+++ b/include/acpi/platform/acenv.h
@@ -311,8 +311,8 @@ typedef char *va_list;
#define ACPI_MEMCMP(s1,s2,n) acpi_ut_memcmp((const char *)(s1), (const char *)(s2), (acpi_size)(n))
#define ACPI_MEMCPY(d,s,n) (void) acpi_ut_memcpy ((d), (s), (acpi_size)(n))
#define ACPI_MEMSET(d,v,n) (void) acpi_ut_memset ((d), (v), (acpi_size)(n))
-#define ACPI_TOUPPER acpi_ut_to_upper
-#define ACPI_TOLOWER acpi_ut_to_lower
+#define ACPI_TOUPPER(c) acpi_ut_to_upper ((int) (c))
+#define ACPI_TOLOWER(c) acpi_ut_to_lower ((int) (c))
#endif /* ACPI_USE_SYSTEM_CLIBRARY */