diff --git a/libs/ilbc/src/iLBC_decode.c b/libs/ilbc/src/iLBC_decode.c
index 55d080e071..fc46fe408c 100644
--- a/libs/ilbc/src/iLBC_decode.c
+++ b/libs/ilbc/src/iLBC_decode.c
@@ -41,7 +41,7 @@
 #include "syntFilter.h"
 
 #if (defined(WIN32)  ||  defined(_WIN32)) && !defined(_WIN64)
-    __inline double rint(double dbl)
+    __inline long int rint(double dbl)
     {
         _asm 
     	{
@@ -50,9 +50,15 @@
         }
     }
 #elif defined (_WIN64)
+#include <intrin.h>
     __inline__ long int rint(double x)
     {
-        return (long int) (x);
+#ifdef _M_X64
+		return (long int)_mm_cvtsd_si64x( _mm_loadu_pd ((const double*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (long int) (x);
+#endif
     }
 #endif
 
diff --git a/libs/spandsp/src/spandsp/fast_convert.h b/libs/spandsp/src/spandsp/fast_convert.h
index a09882edfb..2e794a2701 100644
--- a/libs/spandsp/src/spandsp/fast_convert.h
+++ b/libs/spandsp/src/spandsp/fast_convert.h
@@ -303,29 +303,26 @@ extern "C"
     }
 #elif defined(WIN64)  ||  defined(_WIN64)
     /* x86_64 machines will do best with a simple assignment. */
+#include <intrin.h>
 
     __inline long int lrint(double x)
     {
-        long int i;
-
-        _asm
-        {
-            fld x
-            fistp i
-        };
-        return i;
+#ifdef _M_X64
+		return (long int)_mm_cvtsd_si64x( _mm_loadu_pd ((const double*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (long int) (x);
+#endif
     }
 
     __inline long int lrintf(float x)
     {
-        long int i;
-
-        _asm
-        {
-            fld x
-            fistp i
-        };
-        return i;
+#ifdef _M_X64
+		return _mm_cvt_ss2si( _mm_load_ss((const float*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (long int) (x);
+#endif
     }
 
     __inline long int lfastrint(double x)
diff --git a/libs/voipcodecs/src/voipcodecs/dc_restore.h b/libs/voipcodecs/src/voipcodecs/dc_restore.h
index 6bd5cf7fba..89d98b1ea0 100644
--- a/libs/voipcodecs/src/voipcodecs/dc_restore.h
+++ b/libs/voipcodecs/src/voipcodecs/dc_restore.h
@@ -127,17 +127,34 @@ __inline long lrintf (float flt)
 	return retval;
 }
 #elif defined(_WIN64)
+#include <intrin.h>
+
     __inline__ long int rint(double x)
     {
-        return (long int) (x);
+#ifdef _M_X64
+		return (long int)_mm_cvtsd_si64x( _mm_loadu_pd ((const double*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (long int) (x);
+#endif
     }
 	__inline__ int rintf(float x)
 	{
-		return (int) rint((double) x);
+#ifdef _M_X64
+		return _mm_cvt_ss2si( _mm_load_ss((const float*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (int) (x);
+#endif
 	}
     __inline__ long int lrintf(float x)
     {
-        return (long int) (x);
+#ifdef _M_X64
+		return _mm_cvt_ss2si( _mm_load_ss((const float*)&x) );
+#else
+#warning "Not Supported: Replacing with a simple C cast."
+	return (long int) (x);
+#endif
     }
 #endif