diff --git a/config/SOUE01/symbols.txt b/config/SOUE01/symbols.txt
index 3067576d..f974476a 100644
--- a/config/SOUE01/symbols.txt
+++ b/config/SOUE01/symbols.txt
@@ -26384,11 +26384,11 @@ set__Q23EGG5QuatfFffff = .text:0x8049B390; // type:function size:0x14
 setAxisRotation__Q23EGG5QuatfFRCQ23EGG8Vector3ff = .text:0x8049B3B0; // type:function size:0x98
 norm__Q23EGG5QuatfFv = .text:0x8049B450; // type:function size:0x30
 normalise__Q23EGG5QuatfFv = .text:0x8049B480; // type:function size:0x74
-conjugate__Q23EGG5QuatfFv = .text:0x8049B500; // type:function size:0x48
+conjugate__Q23EGG5QuatfCFv = .text:0x8049B500; // type:function size:0x48
 rotateVector__Q23EGG5QuatfFRCQ23EGG8Vector3f = .text:0x8049B550; // type:function size:0x2A4
 slerpTo__Q23EGG5QuatfCFRCQ23EGG5QuatffRQ23EGG5Quatf = .text:0x8049B800; // type:function size:0x1C4
 limitSlerpTo__Q23EGG5QuatfCFRCQ23EGG5QuatfffRQ23EGG5Quatf = .text:0x8049B9D0; // type:function size:0x1DC
-makeVectorRotation__Q23EGG5QuatfFRQ23EGG8Vector3fRQ23EGG8Vector3f = .text:0x8049BBB0; // type:function size:0x104
+makeVectorRotation__Q23EGG5QuatfFRCQ23EGG8Vector3fRCQ23EGG8Vector3f = .text:0x8049BBB0; // type:function size:0x104
 normalise__Q23EGG8Vector3fFv = .text:0x8049BCC0; // type:function size:0x84
 setLength__Q23EGG8Vector3fFRCQ23EGG8Vector3ff = .text:0x8049BD50; // type:function size:0xB8
 setLength__Q23EGG8Vector3fFf = .text:0x8049BE10; // type:function size:0xA0
diff --git a/include/egg/math/eggQuat.h b/include/egg/math/eggQuat.h
index df67e10d..302de985 100644
--- a/include/egg/math/eggQuat.h
+++ b/include/egg/math/eggQuat.h
@@ -39,14 +39,14 @@ struct Quatf {
     /* 8049b3b0 */ void setAxisRotation(const Vector3f &, f32);
     /* 8049b450 */ f32 norm();
     /* 8049b480 */ void normalise();
-    /* 8049b500 */ Quatf conjugate();
+    /* 8049b500 */ Quatf conjugate() const;
     /*          */ Quatf inverse();
     /* 8049b550 */ Vector3f rotateVector(const Vector3f &);
     /*          */ Vector3f rotateVectorInv(const Vector3f &);
     /* 8049b800 */ void slerpTo(const Quatf &, f32, Quatf &out) const;
     /* 8049b800 */ void limitSlerpTo(const Quatf &, f32, f32, Quatf &out) const;
     /*          */ void makeVectorRotationLimit(Vector3f &, Vector3f &, f32);
-    /* 8049bbb0 */ void makeVectorRotation(Vector3f &, Vector3f &);
+    /* 8049bbb0 */ void makeVectorRotation(const Vector3f &, const Vector3f &);
 
     void multScalar(f32 s) {
         w *= s;
diff --git a/src/egg/math/eggQuat.cpp b/src/egg/math/eggQuat.cpp
index 0ccb90b1..93f06377 100644
--- a/src/egg/math/eggQuat.cpp
+++ b/src/egg/math/eggQuat.cpp
@@ -96,7 +96,7 @@ void Quatf::normalise() {
 }
 
 /* 8049b500 */
-Quatf Quatf::conjugate() {
+Quatf Quatf::conjugate() const {
     Quatf q;
     q.w = w;
     q.v = -1.0f * v;
@@ -211,7 +211,7 @@ void Quatf::limitSlerpTo(const Quatf &q2, f32 t, f32 t2, Quatf &out) const {
 }
 
 /* 8049bbb0 */
-void Quatf::makeVectorRotation(Vector3f &from, Vector3f &to) {
+void Quatf::makeVectorRotation(const Vector3f &from, const Vector3f &to) {
     Vector3f cross = from.cross(to);
     f32 t0 = (from.dot(to) + 1) * 2.0f;