diff --git a/src/core/acpi.c b/src/core/acpi.c
index 07679153..e6912afa 100644
--- a/src/core/acpi.c
+++ b/src/core/acpi.c
@@ -51,7 +51,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 static uint8_t acpi_checksum ( userptr_t table ) {
 	struct acpi_header acpi;
 	uint8_t sum = 0;
-	uint8_t data;
+	uint8_t data = 0;
 	unsigned int i;
 
 	/* Read table length */