diff --git a/Docs/src/history.but b/Docs/src/history.but
index 47c49440..d89d5af6 100644
--- a/Docs/src/history.but
+++ b/Docs/src/history.but
@@ -18,6 +18,8 @@ Released on ?
 
 \b FileReadByte no longer performs a Unicode conversion on non-ASCII characters
 
+\b Fixed !define Unicode null terminator bug (\W{http://sf.net/p/nsis/bugs/1079/}{bug #1079})
+
 \b Fixed MakeNSISW default pushbutton and tab order
 
 \H{v3.0a1} 3.0 Alpha 1
diff --git a/Source/script.cpp b/Source/script.cpp
index 1aba0adc..8bb4fac4 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -3121,7 +3121,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
           }
         }
         define = line.gettoken_str(2);
-        file_buf.add(_T("\0"),1);
+        file_buf.add(_T("\0"),sizeof(TCHAR));
         value = (TCHAR *)file_buf.get();
 
       } else if (!_tcsicmp(define,_T("/math"))) {