--- src/jam.h
+++ src/jam.h
@@ -734,12 +734,12 @@
 
 /* default minimum size of object heap */
 #ifndef DEFAULT_MIN_HEAP
-#define DEFAULT_MIN_HEAP 16*MB
+#define DEFAULT_MIN_HEAP 1*MB
 #endif
 
 /* default maximum size of object heap */
 #ifndef DEFAULT_MAX_HEAP
-#define DEFAULT_MAX_HEAP 128*MB
+#define DEFAULT_MAX_HEAP 8*MB
 #endif
 
 /* default size of the Java stack */