diff --git a/Configuration.mk b/Configuration.mk
index 7b317a6..366b396 100644
--- a/Configuration.mk
+++ b/Configuration.mk
@@ -28,7 +28,7 @@ LIBDL ?=
 # -------------------------------------------------------------
 
 OPTIONS ?=
-OPTIONS += -DBIT64
+#OPTIONS += -DBIT64
 
 # This helps improve performance on some systems.
 
@@ -97,7 +97,8 @@ DEVICES += interface/descriptions.retro
 # -------------------------------------------------------------
 
 GLOSSARY ?= ./bin/retro tools/glossary.retro
-ASSEMBLE ?= ./bin/retro-muri
+ASSEMBLE ?= ./tools/retro-muri.py
+#EXTEND   ?= ./tools/retro-extend.py
 EXTEND   ?= ./bin/retro-extend
 EXPORT   ?= ./bin/retro-embedimage
 RETRO    ?= ./bin/retro
diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index 6ec1ee8..6282f83 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -15,6 +15,7 @@
 - toolchain
 
   - retro-describe(1) now uses embedded glossary data
+  - retro-muri.py: increase memory size for initial image
 
 - documentation
 
diff --git a/tools/retro-muri.py b/tools/retro-muri.py
index c66b4d4..3ba8df1 100755
--- a/tools/retro-muri.py
+++ b/tools/retro-muri.py
@@ -143,7 +143,7 @@ def save(filename):
 
 
 if __name__ == "__main__":
-    image.extend([0] * 1024)
+    image.extend([0] * 1024 * 8)
     pass1()
     pass2()
     save("ngaImage")