diff --git a/source/blender/blenlib/BLI_arithb.h b/source/blender/blenlib/BLI_arithb.h
index 8eb4d5972e3..40076755fa0 100644
--- a/source/blender/blenlib/BLI_arithb.h
+++ b/source/blender/blenlib/BLI_arithb.h
@@ -299,7 +299,7 @@ void Mat3MulMat3(float *m1, float *m3, float *m2);
 #endif
 void Mat4MulMat34(float (*m1)[4], float (*m3)[3], float (*m2)[4]);
 void Mat4CpyMat4(float m1[][4], float m2[][4]);
-void Mat4SwapMat4(float *m1, float *m2);
+void Mat4SwapMat4(float m1[][4], float m2[][4]);
 void Mat3CpyMat3(float m1[][3], float m2[][3]);
 
 void Mat3MulSerie(float answ[][3],