diff --git a/Docs/src/history.but b/Docs/src/history.but
index fec30a48..c4e4f2f9 100644
--- a/Docs/src/history.but
+++ b/Docs/src/history.but
@@ -28,6 +28,8 @@ ANSI targets are deprecated, consider moving to Unicode.
 
 \b StrFunc.nsh now supports a "using" idiom to help with forward-declaration of functions (\W{http://sf.net/p/nsis/bugs/1229}{bug #1229})
 
+\b Zero uninitialized data in icon group (\W{http://sf.net/p/nsis/bugs/1230}{bug #1230})
+
 \S2{} Translations
 
 \b Updated Hindi (\W{http://sf.net/p/nsis/patches/291}{patch #291}) and Portuguese (\W{http://sf.net/p/nsis/bugs/1219}{bug #1219})
diff --git a/Source/icon.cpp b/Source/icon.cpp
index ca967a6d..97f78210 100644
--- a/Source/icon.cpp
+++ b/Source/icon.cpp
@@ -272,10 +272,11 @@ static IconPairs get_icon_order(IconGroup icon1, IconGroup icon2)
 #define destroy_icon_group(p) ( delete [] (p) )
 static LPBYTE generate_icon_group(IconGroup icon, IconPairs order, bool first)
 {
-  LPBYTE group = new BYTE[
+  size_t groupsize = 
     sizeof(IconGroupHeader) // header
-    + order.size() * SIZEOF_RSRC_ICON_GROUP_ENTRY // entries
-  ];
+    + order.size() * SIZEOF_RSRC_ICON_GROUP_ENTRY; // entries
+  LPBYTE group = new BYTE[groupsize];
+  memset(group, 0, groupsize); // Reproducible builds (bug #1230)
 
   IconGroupHeader* header = (IconGroupHeader*) group;