diff --git a/src/basic/math/b947.inv_FAC1.s b/src/basic/math/b947.inv_FAC1.s
index 828a1382..c97d3b7b 100644
--- a/src/basic/math/b947.inv_FAC1.s
+++ b/src/basic/math/b947.inv_FAC1.s
@@ -10,19 +10,19 @@
 ;
 ; This is verified to be identical to the original Microsoft implementation where it was named NEGFAC.
 ;
-; The alternative entry point neg_FAC1_mantissa (NEGFCH) will negate only the mantissa
+; The alternative entry point inv_FAC1_mantissa (NEGFCH) will negate only the mantissa
 ;
 ; See also:
 ; - https://www.c64-wiki.com/wiki/BASIC-ROM
 ; - https://sta.c64.org/cbm64basconv.html
 ;
 
-neg_FAC1:
+inv_FAC1:
 	lda FAC1_sign
 	eor #$FF
 	sta FAC1_sign
 
-neg_FAC1_mantissa:
+inv_FAC1_mantissa:
 
     lda FAC1_mantissa+0
     eor #$FF
diff --git a/src/basic/math/bc9b.QINT.s b/src/basic/math/bc9b.QINT.s
index 0d70bf74..33d9f798 100644
--- a/src/basic/math/bc9b.QINT.s
+++ b/src/basic/math/bc9b.QINT.s
@@ -33,7 +33,7 @@ QINT:
 	tax
 	lda #$FF
 	sta BITS
-	jsr neg_FAC1_mantissa
+	jsr inv_FAC1_mantissa
 	txa
 @1: ldx #FAC1_exponent
     cmp #$F9