diff --git a/src/multiplication.c b/src/multiplication.c
index 398b12e..6354e9e 100644
--- a/src/multiplication.c
+++ b/src/multiplication.c
@@ -255,7 +255,7 @@ int karatsuba_multi(int num1, int num2) {
     return ac * (int)pow(10, 2 * m2) + ad_bc * (int)pow(10, m2) + bd;
 }
 
-int multiply_by_riesel_prime(int num) {
+int multi_by_riesel_prime(int num) {
     return (num << 2) + (num << 3) - (num << 1) - num;
 }
 
diff --git a/src/multiplication.h b/src/multiplication.h
index 547ebe3..7a39a6a 100644
--- a/src/multiplication.h
+++ b/src/multiplication.h
@@ -32,7 +32,7 @@ int bernoulli_multi(int num, int bernoulli);
 float power_multi(float base, int exponent);
 int bitwisee_multi(int num1, int num2);
 int karatsuba_multi(int num1, int num2);
-int multiply_by_riesel_prime(int num);
+int multi_by_riesel_prime(int num);