diff --git a/dll/win32/msvcrt/math.c b/dll/win32/msvcrt/math.c
index 266ab10e1bb..c45dd7ad7fe 100644
--- a/dll/win32/msvcrt/math.c
+++ b/dll/win32/msvcrt/math.c
@@ -588,6 +588,7 @@ __ASM_GLOBAL_FUNC(_ftol,
 
 #endif /* (defined(__GNUC__) || defined(__clang__)) && defined(__i386__) */
 
+#ifndef __REACTOS__
 /*********************************************************************
  *		_fpclass (MSVCRT.@)
  */
@@ -609,6 +610,7 @@ int CDECL _fpclass(double num)
         return s ? _FPCLASS_NN : _FPCLASS_PN;
     }
 }
+#endif // __REACTOS__
 
 /*********************************************************************
  *		_rotl (MSVCRT.@)
@@ -1195,6 +1197,7 @@ int * CDECL __fpecode(void)
     return &msvcrt_get_thread_data()->fpecode;
 }
 
+#ifndef __REACTOS__
 /*********************************************************************
  *		ldexp (MSVCRT.@)
  */
@@ -1208,6 +1211,7 @@ double CDECL ldexp(double num, int exp)
     return math_error(_UNDERFLOW, "ldexp", num, exp, z);
   return z;
 }
+#endif // __REACTOS__
 
 /*********************************************************************
  *		_cabs (MSVCRT.@)
diff --git a/dll/win32/msvcrt/msvcrt.spec b/dll/win32/msvcrt/msvcrt.spec
index d7a1ded314f..caef1e5b494 100644
--- a/dll/win32/msvcrt/msvcrt.spec
+++ b/dll/win32/msvcrt/msvcrt.spec
@@ -1257,12 +1257,12 @@
 @ cdecl -arch=!i386 acosf(float)
 @ cdecl asctime(ptr)
 @ cdecl -version=0x600+ asctime_s(ptr long ptr)
-@ cdecl asin(double) MSVCRT_asin
+@ cdecl asin(double)
 @ cdecl -arch=!i386 asinf(float)
-@ cdecl atan(double) MSVCRT_atan
+@ cdecl atan(double)
 @ cdecl atan2(double double)
 @ cdecl -arch=!i386 atan2f(float float)
-@ cdecl -arch=!i386 atanf(float) MSVCRT_atanf
+@ cdecl -arch=!i386 atanf(float)
 @ cdecl -private atexit(ptr) MSVCRT_atexit  # not imported to avoid conflicts with Mingw
 @ cdecl atof(str)
 @ cdecl atoi(str)
@@ -1286,7 +1286,7 @@
 @ cdecl -arch=win64 difftime(long long) _difftime64
 @ cdecl -ret64 div(long long)
 @ cdecl exit(long)
-@ cdecl exp(double) MSVCRT_exp
+@ cdecl exp(double)
 @ cdecl -arch=!i386 expf(float)
 @ cdecl fabs(double)
 @ cdecl -arch=arm,arm64 fabsf(float)
@@ -1425,8 +1425,8 @@
 @ cdecl -arch=!i386 sinhf(float)
 @ varargs sprintf(ptr str)
 @ varargs -version=0x600+ sprintf_s(ptr long str)
-@ cdecl sqrt(double) MSVCRT_sqrt
-@ cdecl -arch=!i386 sqrtf(float) MSVCRT_sqrtf
+@ cdecl sqrt(double)
+@ cdecl -arch=!i386 sqrtf(float)
 @ cdecl srand(long)
 @ varargs sscanf(str str)
 @ varargs -version=0x600+ sscanf_s(str str)
@@ -1464,9 +1464,9 @@
 @ varargs -version=0x600+ swscanf_s(wstr wstr)
 @ cdecl system(str)
 @ cdecl tan(double)
-@ cdecl tanh(double) MSVCRT_tanh
+@ cdecl tanh(double)
 @ cdecl -arch=!i386 tanf(float)
-@ cdecl -arch=!i386 tanhf(float) MSVCRT_tanhf
+@ cdecl -arch=!i386 tanhf(float)
 @ cdecl -arch=win32 time(ptr) _time32
 @ cdecl -arch=win64 time(ptr) _time64
 @ cdecl tmpfile()