diff --git a/foreign/c/primitives/chibi/foreign-c.stub b/foreign/c/primitives/chibi/foreign-c.stub
index 63308f7..0f4c6b2 100644
--- a/foreign/c/primitives/chibi/foreign-c.stub
+++ b/foreign/c/primitives/chibi/foreign-c.stub
@@ -68,7 +68,7 @@
 (c-declare "void c_bytevector_u8_set(void* pointer, int offset, uint8_t value) { *(uint8_t*)((char*)pointer + offset) = value; }")
 (define-c void (c-bytevector-u8-set! c_bytevector_u8_set) ((maybe-null pointer void*) int uint8_t))
 
-(c-declare "int8_t c_bytevector_u8_ref (void* pointer, int offset) { return *(int8_t*)((char*)pointer + offset); }")
+(c-declare "int8_t c_bytevector_u8_ref (void* pointer, int offset) { return *(uint8_t*)((char*)pointer + offset); }")
 (define-c int8_t (c-bytevector-u8-ref c_bytevector_u8_ref) ((maybe-null pointer void*) int))
 
 (c-declare "void c_bytevector_pointer_set (void* pointer, int offset, void* value) { char* p = (char*)pointer + offset; *(char**)p = value; }")