diff --git a/code/cgame/cg_ents.c b/code/cgame/cg_ents.c
index 484bce13..1682e4e6 100644
--- a/code/cgame/cg_ents.c
+++ b/code/cgame/cg_ents.c
@@ -49,7 +49,7 @@ void CG_PositionEntityOnTag( refEntity_t *entity, const refEntity_t *parent,
 	}
 
 	// had to cast away the const to avoid compiler problems...
-	MatrixMultiply( lerped.axis, ((refEntity_t *)parent)->axis, entity->axis );
+	Q_MatrixMultiply( lerped.axis, ((refEntity_t *)parent)->axis, entity->axis );
 	entity->backlerp = parent->backlerp;
 }
 
@@ -80,8 +80,8 @@ void CG_PositionRotatedEntityOnTag( refEntity_t *entity, const refEntity_t *pare
 	}
 
 	// had to cast away the const to avoid compiler problems...
-	MatrixMultiply( entity->axis, lerped.axis, tempAxis );
-	MatrixMultiply( tempAxis, ((refEntity_t *)parent)->axis, entity->axis );
+	Q_MatrixMultiply( entity->axis, lerped.axis, tempAxis );
+	Q_MatrixMultiply( tempAxis, ((refEntity_t *)parent)->axis, entity->axis );
 }
 
 
diff --git a/code/cgame/cg_weapons.c b/code/cgame/cg_weapons.c
index 64452411..bca2c848 100644
--- a/code/cgame/cg_weapons.c
+++ b/code/cgame/cg_weapons.c
@@ -1265,7 +1265,7 @@ void CG_AddPlayerWeapon( refEntity_t *parent, playerState_t *ps, centity_t *cent
 
 	VectorMA(gun.origin, lerped.origin[2], parent->axis[2], gun.origin);
 
-	MatrixMultiply(lerped.axis, ((refEntity_t *)parent)->axis, gun.axis);
+	Q_MatrixMultiply(lerped.axis, ((refEntity_t *)parent)->axis, gun.axis);
 	gun.backlerp = parent->backlerp;
 
 	CG_AddWeaponWithPowerups( &gun, cent->currentState.powerups );
diff --git a/code/q3_ui/ui_players.c b/code/q3_ui/ui_players.c
index ad15fe78..a98ff082 100644
--- a/code/q3_ui/ui_players.c
+++ b/code/q3_ui/ui_players.c
@@ -305,7 +305,7 @@ static void UI_PositionEntityOnTag( refEntity_t *entity, const refEntity_t *pare
 	}
 
 	// cast away const because of compiler problems
-	MatrixMultiply( lerped.axis, ((refEntity_t*)parent)->axis, entity->axis );
+	Q_MatrixMultiply( lerped.axis, ((refEntity_t*)parent)->axis, entity->axis );
 	entity->backlerp = parent->backlerp;
 }
 
@@ -332,8 +332,8 @@ static void UI_PositionRotatedEntityOnTag( refEntity_t *entity, const refEntity_
 	}
 
 	// cast away const because of compiler problems
-	MatrixMultiply( entity->axis, ((refEntity_t *)parent)->axis, tempAxis );
-	MatrixMultiply( lerped.axis, tempAxis, entity->axis );
+	Q_MatrixMultiply( entity->axis, ((refEntity_t *)parent)->axis, tempAxis );
+	Q_MatrixMultiply( lerped.axis, tempAxis, entity->axis );
 }
 
 
diff --git a/code/qcommon/q_math.c b/code/qcommon/q_math.c
index 9627a829..1ca3c428 100644
--- a/code/qcommon/q_math.c
+++ b/code/qcommon/q_math.c
@@ -337,8 +337,8 @@ void RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point,
 	zrot[1][0] = -sin( rad );
 	zrot[1][1] = cos( rad );
 
-	MatrixMultiply( m, zrot, tmpmat );
-	MatrixMultiply( tmpmat, im, rot );
+	Q_MatrixMultiply( m, zrot, tmpmat );
+	Q_MatrixMultiply( tmpmat, im, rot );
 
 	for ( i = 0; i < 3; i++ ) {
 		dst[i] = rot[i][0] * point[0] + rot[i][1] * point[1] + rot[i][2] * point[2];
@@ -1033,10 +1033,10 @@ void Matrix4Multiply(const float a[16], const float b[16], float out[16])
 
 /*
 ================
-MatrixMultiply
+Q_MatrixMultiply
 ================
 */
-void MatrixMultiply(float in1[3][3], float in2[3][3], float out[3][3]) {
+void Q_MatrixMultiply(float in1[3][3], float in2[3][3], float out[3][3]) {
 	out[0][0] = in1[0][0] * in2[0][0] + in1[0][1] * in2[1][0] +
 				in1[0][2] * in2[2][0];
 	out[0][1] = in1[0][0] * in2[0][1] + in1[0][1] * in2[1][1] +
diff --git a/code/qcommon/q_shared.h b/code/qcommon/q_shared.h
index 59d3acc1..ff6f1ee0 100644
--- a/code/qcommon/q_shared.h
+++ b/code/qcommon/q_shared.h
@@ -709,7 +709,7 @@ qboolean Matrix4Compare(const float a[16], const float b[16]);
 void Matrix4Copy(const float in[16], float out[16]);
 void Matrix4Multiply(const float a[16], const float b[16], float out[16]);
 
-void MatrixMultiply(float in1[3][3], float in2[3][3], float out[3][3]);
+void Q_MatrixMultiply(float in1[3][3], float in2[3][3], float out[3][3]);
 void AngleVectors( const vec3_t angles, vec3_t forward, vec3_t right, vec3_t up);
 void PerpendicularVector( vec3_t dst, const vec3_t src );
 
diff --git a/code/server/sv_game.c b/code/server/sv_game.c
index ebfa726c..89e3dc08 100644
--- a/code/server/sv_game.c
+++ b/code/server/sv_game.c
@@ -819,7 +819,7 @@ intptr_t SV_GameSystemCalls( intptr_t *args ) {
 		return FloatAsInt( sqrt( VMF(1) ) );
 
 	case TRAP_MATRIXMULTIPLY:
-		MatrixMultiply( VMA(1), VMA(2), VMA(3) );
+		Q_MatrixMultiply( VMA(1), VMA(2), VMA(3) );
 		return 0;
 
 	case TRAP_ANGLEVECTORS:
diff --git a/code/ui/ui_players.c b/code/ui/ui_players.c
index ee30febc..fcca94c5 100644
--- a/code/ui/ui_players.c
+++ b/code/ui/ui_players.c
@@ -306,7 +306,7 @@ static void UI_PositionEntityOnTag( refEntity_t *entity, const refEntity_t *pare
 	}
 
 	// cast away const because of compiler problems
-	MatrixMultiply( lerped.axis, ((refEntity_t*)parent)->axis, entity->axis );
+	Q_MatrixMultiply( lerped.axis, ((refEntity_t*)parent)->axis, entity->axis );
 	entity->backlerp = parent->backlerp;
 }
 
@@ -333,8 +333,8 @@ static void UI_PositionRotatedEntityOnTag( refEntity_t *entity, const refEntity_
 	}
 
 	// cast away const because of compiler problems
-	MatrixMultiply( entity->axis, ((refEntity_t *)parent)->axis, tempAxis );
-	MatrixMultiply( lerped.axis, tempAxis, entity->axis );
+	Q_MatrixMultiply( entity->axis, ((refEntity_t *)parent)->axis, tempAxis );
+	Q_MatrixMultiply( lerped.axis, tempAxis, entity->axis );
 }