diff --git a/src/test/csrc/ram.cpp b/src/test/csrc/ram.cpp
index cac952f6a28484edd98c6a9f0a5b7b0627373357..df61c5446f89d4917049ae574c0a5e5697b39a5e 100644
--- a/src/test/csrc/ram.cpp
+++ b/src/test/csrc/ram.cpp
@@ -4,7 +4,7 @@
 #include "common.h"
 #include "ram.h"
 
-#define RAMSIZE (256 * 1024 * 1024UL)
+#define RAMSIZE (64 * 1024 * 1024 * 1024UL)
 
 #ifdef WITH_DRAMSIM3
 #include "cosimulation.h"