diff --git a/basic-geometry/vector2.h b/basic-geometry/vector2.h
index 1ded124..7bdc27c 100644
--- a/basic-geometry/vector2.h
+++ b/basic-geometry/vector2.h
@@ -213,7 +213,7 @@ inline int bgc_fp32_vector2_divide(BGC_FP32_Vector2* quotient, const BGC_FP32_Ve
 
 inline int bgc_fp64_vector2_divide(BGC_FP64_Vector2* quotient, const BGC_FP64_Vector2* dividend, const double divisor)
 {
-    if (bgc_fp32_is_zero(divisor) || isnan(divisor)) {
+    if (bgc_fp64_is_zero(divisor) || isnan(divisor)) {
         return BGC_FAILURE;
     }