diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 1808042..66a470a 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -25,7 +25,7 @@
 LOCAL_MODULE := fastboot
 LOCAL_MODULE_TAGS := debug
 LOCAL_CONLYFLAGS += -std=gnu99
-LOCAL_CFLAGS += -Wall -Wextra -Werror
+LOCAL_CFLAGS += -Wall -Wextra -Werror -Wunreachable-code
 
 LOCAL_CFLAGS += -DFASTBOOT_REVISION='"$(fastboot_version)"'
 
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 5ad55d4..0f9d03a 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -721,12 +721,14 @@
     ZipArchiveHandle zip;
     int error = OpenArchive(filename, &zip);
     if (error != 0) {
+        CloseArchive(zip);
         die("failed to open zip file '%s': %s", filename, ErrorCodeString(error));
     }
 
     unsigned sz;
     void* data = unzip_file(zip, "android-info.txt", &sz);
     if (data == 0) {
+        CloseArchive(zip);
         die("update package '%s' has no android-info.txt", filename);
     }
 
@@ -738,6 +740,7 @@
             if (images[i].is_optional) {
                 continue;
             }
+            CloseArchive(zip);
             exit(1); // unzip_to_file already explained why.
         }
         fastboot_buffer buf;
diff --git a/fastboot/fastboot.h b/fastboot/fastboot.h
index 1786e49..481c501 100644
--- a/fastboot/fastboot.h
+++ b/fastboot/fastboot.h
@@ -69,7 +69,7 @@
 /* util stuff */
 double now();
 char *mkmsg(const char *fmt, ...);
-void die(const char *fmt, ...);
+__attribute__((__noreturn__)) void die(const char *fmt, ...);
 
 void get_my_path(char *path);