diff --git a/neo/d3xp/script/Script_Interpreter.h b/neo/d3xp/script/Script_Interpreter.h
index e7ec0f64..7da58457 100644
--- a/neo/d3xp/script/Script_Interpreter.h
+++ b/neo/d3xp/script/Script_Interpreter.h
@@ -146,7 +146,26 @@ ID_INLINE void idInterpreter::Push( intptr_t value ) {
 	if ( localstackUsed + sizeof( intptr_t ) > LOCALSTACK_SIZE ) {
 		Error( "Push: locals stack overflow\n" );
 	}
-	*( intptr_t * )&localstack[ localstackUsed ]	= value;
+	// DG: fix for 64bit Big Endian machines
+	//*( intptr_t * )&localstack[ localstackUsed ]	= value;
+	int val = value;
+	assert(value == val && "I really assumed that value would always fit into 32bit");
+	// dhewm3 used to store these values on localstack[] as intptr_t, even though
+	// they always seem to be int32. Unfortunately, all the code reading localstack[]
+	// gets the pointer to &localstack[ localstackUsed ] and then interprets that
+	// as int* or float* or whatever.
+	// So with 64bit machines it's stored as the wrong size (intptr_t is int64, int is int32),
+	// and on Big Endian the values are just 0 (or UINT_MAX if value < 0) - on Little Endian
+	// the first 4 bytes are the ones with actual data so the bug was hidden).
+	// To fix this, now a regular itn is stored at `&localstack[ localstackUsed ]`,
+	// as expected by the code using localstack[].
+	// TODO: once this has been tested more (and the assertion above has never triggered),
+	//       change idInterpreter::Push() to take a regular int argument instead of intptr_t.
+	int *stackVar = ( int * )&localstack[ localstackUsed ];
+	*stackVar = val;
+
+	// even though a 32bit int is put onto the stack, increase it by sizeof(intptr_t)
+	// so it remains aligned to multiples of the native pointer size
 	localstackUsed += sizeof( intptr_t );
 }
 
diff --git a/neo/game/script/Script_Interpreter.h b/neo/game/script/Script_Interpreter.h
index e7ec0f64..7da58457 100644
--- a/neo/game/script/Script_Interpreter.h
+++ b/neo/game/script/Script_Interpreter.h
@@ -146,7 +146,26 @@ ID_INLINE void idInterpreter::Push( intptr_t value ) {
 	if ( localstackUsed + sizeof( intptr_t ) > LOCALSTACK_SIZE ) {
 		Error( "Push: locals stack overflow\n" );
 	}
-	*( intptr_t * )&localstack[ localstackUsed ]	= value;
+	// DG: fix for 64bit Big Endian machines
+	//*( intptr_t * )&localstack[ localstackUsed ]	= value;
+	int val = value;
+	assert(value == val && "I really assumed that value would always fit into 32bit");
+	// dhewm3 used to store these values on localstack[] as intptr_t, even though
+	// they always seem to be int32. Unfortunately, all the code reading localstack[]
+	// gets the pointer to &localstack[ localstackUsed ] and then interprets that
+	// as int* or float* or whatever.
+	// So with 64bit machines it's stored as the wrong size (intptr_t is int64, int is int32),
+	// and on Big Endian the values are just 0 (or UINT_MAX if value < 0) - on Little Endian
+	// the first 4 bytes are the ones with actual data so the bug was hidden).
+	// To fix this, now a regular itn is stored at `&localstack[ localstackUsed ]`,
+	// as expected by the code using localstack[].
+	// TODO: once this has been tested more (and the assertion above has never triggered),
+	//       change idInterpreter::Push() to take a regular int argument instead of intptr_t.
+	int *stackVar = ( int * )&localstack[ localstackUsed ];
+	*stackVar = val;
+
+	// even though a 32bit int is put onto the stack, increase it by sizeof(intptr_t)
+	// so it remains aligned to multiples of the native pointer size
 	localstackUsed += sizeof( intptr_t );
 }