--- dyld/dyld-732.8/src/dyld2.cpp
+++ dyld/dyld-733.6/src/dyld2.cpp
@@ -1468,6 +1468,25 @@
 			sImageRoots.erase(it);
 			break;
 		}
+	}
+
+	// If this image is the potential canonical definition of any weak defs, then set them to a tombstone value
+	if ( gLinkContext.weakDefMapInitialized && image->hasCoalescedExports() ) {
+		Diagnostics diag;
+		const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)image->machHeader();
+		ma->forEachWeakDef(diag, ^(const char *symbolName, uintptr_t imageOffset, bool isFromExportTrie) {
+			auto it = gLinkContext.weakDefMap.find(symbolName);
+			assert(it != gLinkContext.weakDefMap.end());
+			it->second = { nullptr, 0 };
+			if ( !isFromExportTrie ) {
+				// The string was already duplicated if we are an export trie
+				// so only strdup as we are the nlist
+				size_t hash1 = ImageLoader::HashCString::hash(it->first);
+				it->first = strdup(it->first);
+				size_t hash2 = ImageLoader::HashCString::hash(it->first);
+				assert(hash1 == hash2);
+			}
+		});
 	}
 
 	// log if requested