diff --git a/src/convert.asm b/src/convert.asm
index 5f10c7d..eb04ddb 100644
--- a/src/convert.asm
+++ b/src/convert.asm
@@ -1,6 +1,7 @@
 %include "src/constants.asm"
 
 extern	clamp
+extern	clampu
 
 section .bss
 	cnvtBuff	resb	67
@@ -368,7 +369,7 @@ utoa:
 	mov	rdi, rdx
 	xor	rsi, rsi
 	mov	rdx, 64
-	call	clamp
+	call	clampu
 	mov	r14, rax
 	; Store padding character
 	mov	rdi, ' '