diff --git a/netplay.cpp b/netplay.cpp
index 61842568..76978ef9 100644
--- a/netplay.cpp
+++ b/netplay.cpp
@@ -82,7 +82,7 @@ int FCEUNET_SendCommand(uint8 cmd, uint32 len)
 {
  //mbg merge 7/17/06 changed to alloca
  //uint8 buf[numlocal + 1 + 4];
- uint8 *buf = (uint8*)_alloca(numlocal+1+4);
+ uint8 *buf = (uint8*)alloca(numlocal+1+4);
  
 
  buf[0] = 0xFF;
diff --git a/types.h b/types.h
index 89908772..19ca2f64 100644
--- a/types.h
+++ b/types.h
@@ -22,6 +22,8 @@
 #ifndef __FCEU_TYPES
 #define __FCEU_TYPES
 
+#include <stdlib.h>
+
 #define FCEU_VERSION_NUMERIC 9816
 #define FCEU_NAME "FCEUX"
 #define FCEU_VERSION_STRING "1.07"
@@ -47,11 +49,18 @@ typedef signed int int32;
 #define stat _stat
 #define fstat _fstat
 #define mkdir _mkdir
+#define alloca _alloca
 #define W_OK 2
 #define R_OK 2
 #define X_OK 1
 #define F_OK 0
 #else
+
+//mingw32 doesnt prototype this for some reason
+#ifdef __MINGW32__
+void *alloca(size_t);
+#endif
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/wave.cpp b/wave.cpp
index 62880e84..81abd14b 100644
--- a/wave.cpp
+++ b/wave.cpp
@@ -18,7 +18,7 @@ void FCEU_WriteWaveData(int32 *Buffer, int Count)
 {
 	//mbg merge 7/17/06 changed to alloca
  //int16 temp[Count];  /* Yay.  Is this the first use of this "feature" of C in FCE Ultra? */
- int16 *temp = (int16*)_alloca(Count*2);
+ int16 *temp = (int16*)alloca(Count*2);
 
  int16 *dest;
  int x;
@@ -52,7 +52,7 @@ void FCEU_WriteWaveData(int32 *Buffer, int Count)
 	 {
 		 //mbg merge 7/17/06 changed to alloca
 		 //int8 temp2[Count];
-		 int8 *temp2 = (int8*)_alloca(Count);
+		 int8 *temp2 = (int8*)alloca(Count);
 		 int P;
 		 for(P=0;P<Count;P++)
 			 *(((uint8*)temp2)+P)=((int8)(temp[P]>>8))^128;