diff --git a/src/core/libraries/libc/libc_math.cpp b/src/core/libraries/libc/libc_math.cpp
index 281585c6..3b51c80e 100644
--- a/src/core/libraries/libc/libc_math.cpp
+++ b/src/core/libraries/libc/libc_math.cpp
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <cmath>
+#include "common/assert.h"
 #include "core/libraries/libc/libc_math.h"
 
 namespace Libraries::LibC {
@@ -38,8 +39,13 @@ double PS4_SYSV_ABI ps4__Sin(double x) {
     return sin(x);
 }
 
-float PS4_SYSV_ABI ps4__Fsin(float arg) {
-    return sinf(arg);
+float PS4_SYSV_ABI ps4__Fsin(float arg, unsigned int m, int n) {
+    ASSERT(n == 0);
+    if (m != 0) {
+        return cosf(arg);
+    } else {
+        return sinf(arg);
+    }
 }
 
 double PS4_SYSV_ABI ps4_exp2(double arg) {
diff --git a/src/core/libraries/libc/libc_math.h b/src/core/libraries/libc/libc_math.h
index 83af029e..70e2f99b 100644
--- a/src/core/libraries/libc/libc_math.h
+++ b/src/core/libraries/libc/libc_math.h
@@ -13,7 +13,7 @@ float PS4_SYSV_ABI ps4_tanf(float num);
 float PS4_SYSV_ABI ps4_asinf(float num);
 double PS4_SYSV_ABI ps4_pow(double base, double exponent);
 double PS4_SYSV_ABI ps4__Sin(double x);
-float PS4_SYSV_ABI ps4__Fsin(float arg);
+float PS4_SYSV_ABI ps4__Fsin(float arg, unsigned int,int);
 double PS4_SYSV_ABI ps4_exp2(double arg);
 float PS4_SYSV_ABI ps4_powf(float x, float y);
 float PS4_SYSV_ABI ps4_roundf(float arg);