diff --git a/dfhack/DFContext.cpp b/dfhack/DFContext.cpp
index 9406186df..9013c5659 100644
--- a/dfhack/DFContext.cpp
+++ b/dfhack/DFContext.cpp
@@ -66,7 +66,9 @@ Context::~Context()
 bool Context::isValid()
 {
     //FIXME: check for error states here
-    if(d->p->isIdentified());
+    if(d->p->isIdentified())
+        return true;
+    return false;
 }
 
 bool Context::Attach()
diff --git a/output/Memory.xml b/output/Memory.xml
index 96589944b..467145962 100755
--- a/output/Memory.xml
+++ b/output/Memory.xml
@@ -1824,14 +1824,13 @@ map_data_1b60_offset          0x1B9c
         WORLD + 0x54E80
         <Address name="translation_vector">24</Address>
         <Offset name="word_table">0x4C</Offset>
-<!--
-        
+
         Constructions
         =============
-        WORLD + 0x108
-        <Address name="construction_vector">0x165b290</Address>
+        WORLD + 0x84
+        <Address name="construction_vector">0x92D0144</Address> 0x165b290
         <Offset name="sizeof_construction">0x14</Offset>
-        
+<!--
         Translations
         ============
         WORLD + 0x54E50