diff --git a/Makefile b/Makefile
index d7e070d8..32e5cb0a 100755
--- a/Makefile
+++ b/Makefile
@@ -257,7 +257,6 @@ ALL_ASSETS_BUILT += $(patsubst $(UCODE_IN_DIR)/%.bin,$(UCODE_OUT_DIR)/%.bin,$(UC
 
 $(BUILD_DIR)/lib/%.o: OPT_FLAGS := -O2
 $(BUILD_DIR)/lib/src/al/%.o: OPT_FLAGS := -O3
-$(BUILD_DIR)/lib/src/gu/guPerspectiveF.o: OPT_FLAGS := -O2
 $(BUILD_DIR)/lib/src/os/%.o: OPT_FLAGS := -O1
 $(BUILD_DIR)/lib/src/os/osViMgr.o: OPT_FLAGS := -O2
 $(BUILD_DIR)/lib/src/os/osCreatePiManager.o: OPT_FLAGS := -O2
diff --git a/lib/src/gu/guPerspectiveF.c b/lib/src/gu/guPerspectiveF.c
index 2b871642..6ad42a70 100644
--- a/lib/src/gu/guPerspectiveF.c
+++ b/lib/src/gu/guPerspectiveF.c
@@ -6,38 +6,42 @@
 #include "libc/math.h"
 #include "PR/gu.h"
 
-#if 0
-void guPerspectiveF(float mf[4][4], u16 *perspNorm, float fovy, float aspect, float near, float far, float scale)
-{
-	float	cot;
-	int	i, j;
+void guPerspectiveF(Matrix mf, u16 *perspNorm, float fovy, float aspect, float near, float far, float scale) {
+    float cot;
+    int i, j;
 
-	guMtxIdentF(mf);
+    guMtxIdentF(mf);
 
-	fovy *= 3.1415926 / 180.0;
-	cot = cosf (fovy/2) / sinf (fovy/2);
+    fovy *= 3.1415926 / 180.0;
+    cot = cosf (fovy/2) / sinf (fovy/2);
 
-	mf[0][0] = cot / aspect;
-	mf[1][1] = cot;
-	mf[2][2] = (near + far) / (near - far);
-	mf[2][3] = -1;
-	mf[3][2] = (2 * near * far) / (near - far);
-	mf[3][3] = 0;
+    mf[0][0] = cot / aspect;
+    mf[1][1] = cot;
+    mf[2][2] = (near + far) / (near - far);
+    mf[2][3] = -1;
+    mf[3][2] = (2 * near * far) / (near - far);
+    mf[3][3] = 0;
 
-	for (i=0; i<4; i++)
-	    for (j=0; j<4; j++)
-		mf[i][j] *= scale;
+    for (i=0; i<4; i++) {
+        for (j=0; j<4; j++)
+            mf[i][j] *= scale;
+    }
 
-	if (perspNorm != (u16 *) NULL) {
-	    if (near+far<=2.0) {
-		*perspNorm = (u16) 0xFFFF;
-	    } else  {
-		*perspNorm = (u16) ((2.0*65536.0)/(near+far));
-		if (*perspNorm<=0)
-		    *perspNorm = (u16) 0x0001;
-	    }
-	}
+    if (perspNorm != (u16 *) NULL) {
+        if (near+far<=2.0) {
+            *perspNorm = (u16) 0xFFFF;
+        } else {
+            *perspNorm = (u16) ((2.0*65536.0)/(near+far));
+        if (*perspNorm<=0)
+            *perspNorm = (u16) 0x0001;
+        }
+    }
+}
+
+void guPerspective(Mtx *m, u16 *perspNorm, float fovy, float aspect, float near, float far, float scale) {
+    Matrix mf;
+
+    guPerspectiveF(mf, perspNorm, fovy, aspect, near, far, scale);
+
+    guMtxF2L(mf, m);
 }
-#else
-GLOBAL_ASM("lib/asm/non_matchings/unknown_0CCF90/guPerspectiveF.s")
-#endif