diff --git a/platform/macclassic.c b/platform/macclassic.c
index f1841a9..223cd18 100644
--- a/platform/macclassic.c
+++ b/platform/macclassic.c
@@ -15,6 +15,10 @@
 #include <string.h>
 #include <ctype.h>
 
+#ifdef __MWERKS__
+#include <alloca.h>
+#endif
+ 
 /*
  * Most of the API calls in here are, according to ADC, available since
  *  MacOS 8.1. I don't think I used any MacOS 9 or CarbonLib-specific