diff --git a/qpms/kahansum.h b/qpms/kahansum.h
index 66ef1c1..c365574 100644
--- a/qpms/kahansum.h
+++ b/qpms/kahansum.h
@@ -1,9 +1,9 @@
 #ifndef KAHANSUM_H
 #define KAHANSUM_H
 
-static inline void kahaninit(double *sum, double *compensation) {
-	sum = 0;
-	compensation = 0;
+static inline void kahaninit(double * const sum, double * const compensation) {
+	*sum = 0;
+	*compensation = 0;
 }
 
 static inline void kahanadd(double *sum, double *compensation, double input) {
@@ -14,9 +14,9 @@ static inline void kahanadd(double *sum, double *compensation, double input) {
 }
 
 
-static inline void ckahaninit(complex double *sum, complex double *compensation) {
-	sum = 0;
-	compensation = 0;
+static inline void ckahaninit(complex double * const sum, complex double * const compensation) {
+	*sum = 0;
+	*compensation = 0;
 }
 
 static inline void ckahanadd(complex double *sum, complex double *compensation, complex double input) {