diff --git a/arm-wt-22k/host_src/eas_types.h b/arm-wt-22k/host_src/eas_types.h
index 56d0b53d..69bacf91 100644
--- a/arm-wt-22k/host_src/eas_types.h
+++ b/arm-wt-22k/host_src/eas_types.h
@@ -84,7 +84,11 @@ typedef long EAS_RESULT;
 #define EAS_BUFFER_FULL                     5
 
 /* EAS_STATE return codes */
+#if defined(_WIN64)
+typedef long long EAS_STATE;
+#else
 typedef long EAS_STATE;
+#endif
 typedef enum
 {
     EAS_STATE_READY = 0,
@@ -123,8 +127,13 @@ typedef char EAS_CHAR;
 typedef unsigned short EAS_U16;
 typedef short EAS_I16;
 
+#if defined(_WIN64)
+typedef unsigned long long EAS_U32;
+typedef long long EAS_I32;
+#else
 typedef unsigned long EAS_U32;
 typedef long EAS_I32;
+#endif
 
 typedef unsigned EAS_UINT;
 typedef int EAS_INT;
diff --git a/arm-wt-22k/lib_src/eas_mixer.c b/arm-wt-22k/lib_src/eas_mixer.c
index 9ccdaf8f..4fce6eea 100644
--- a/arm-wt-22k/lib_src/eas_mixer.c
+++ b/arm-wt-22k/lib_src/eas_mixer.c
@@ -109,9 +109,9 @@ void EAS_MixEnginePrep (S_EAS_DATA *pEASData, EAS_I32 numSamples)
 
     /* clear the mix buffer */
 #if (NUM_OUTPUT_CHANNELS == 2)
-    EAS_HWMemSet(pEASData->pMixBuffer, 0, numSamples * (EAS_I32) sizeof(long) * 2);
+    EAS_HWMemSet(pEASData->pMixBuffer, 0, numSamples * (EAS_I32) sizeof(EAS_I32) * 2);
 #else
-    EAS_HWMemSet(pEASData->pMixBuffer, 0, (EAS_I32) numSamples * (EAS_I32) sizeof(long));
+    EAS_HWMemSet(pEASData->pMixBuffer, 0, (EAS_I32) numSamples * (EAS_I32) sizeof(EAS_I32));
 #endif
 
     /* need to clear other side-chain effect buffers (chorus & reverb) */
@@ -263,11 +263,14 @@ void EAS_MixEnginePost (S_EAS_DATA *pEASData, EAS_I32 numSamples)
  *
  *----------------------------------------------------------------------------
 */
-void SynthMasterGain (long *pInputBuffer, EAS_PCM *pOutputBuffer, EAS_U16 nGain, EAS_U16 numSamples) {
-
+void SynthMasterGain(EAS_I32 *pInputBuffer,
+                     EAS_PCM *pOutputBuffer,
+                     EAS_U16 nGain,
+                     EAS_U16 numSamples)
+{
     /* loop through the buffer */
     while (numSamples) {
-        long s;
+        EAS_I32 s;
 
         numSamples--;
         /* read a sample from the input buffer and add some guard bits */
@@ -278,7 +281,7 @@ void SynthMasterGain (long *pInputBuffer, EAS_PCM *pOutputBuffer, EAS_U16 nGain,
         s = s >> 7;
 
         /* apply master gain */
-        s *= (long) nGain;
+        s *= (EAS_I32) nGain;
 
         /* shift to lower 16-bits */
         /*lint -e{704} <avoid divide for performance>*/
diff --git a/arm-wt-22k/lib_src/eas_mixer.h b/arm-wt-22k/lib_src/eas_mixer.h
index b2eb33be..7bb2078d 100644
--- a/arm-wt-22k/lib_src/eas_mixer.h
+++ b/arm-wt-22k/lib_src/eas_mixer.h
@@ -40,7 +40,10 @@
 
 #include "eas_effects.h"
 
-extern void SynthMasterGain( long *pInputBuffer, EAS_PCM *pOutputBuffer, EAS_U16 nGain, EAS_U16 nNumLoopSamples);
+extern void SynthMasterGain(EAS_I32 *pInputBuffer,
+                            EAS_PCM *pOutputBuffer,
+                            EAS_U16 nGain,
+                            EAS_U16 nNumLoopSamples);
 
 /*----------------------------------------------------------------------------
  * EAS_MixEngineInit()