diff --git a/minzip/Android.mk b/minzip/Android.mk
index 68485ab..6cca092 100644
--- a/minzip/Android.mk
+++ b/minzip/Android.mk
@@ -14,6 +14,8 @@
 
 LOCAL_STATIC_LIBRARIES := libselinux
 
+LOCAL_CFLAGS += -DPLATFORM_SDK_VERSION=$(PLATFORM_SDK_VERSION)
+
 LOCAL_MODULE := libminzip
 
 LOCAL_CFLAGS += -Wall
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c
index ac6f5c3..aac162d 100644
--- a/minzip/SysUtil.c
+++ b/minzip/SysUtil.c
@@ -116,7 +116,12 @@
 
     // Reserve enough contiguous address space for the whole file.
     unsigned char* reserve;
+#if (PLATFORM_SDK_VERSION >= 21)
     reserve = mmap64(NULL, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
+#else
+    // Older versions of Android do not have mmap64 so we will just use mmap instead
+    reserve = mmap(NULL, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
+#endif
     if (reserve == MAP_FAILED) {
         LOGW("failed to reserve address space: %s\n", strerror(errno));
         return -1;
@@ -138,8 +143,12 @@
             LOGW("failed to parse range %d in block map\n", i);
             return -1;
         }
-
+#if (PLATFORM_SDK_VERSION >= 21)
         void* addr = mmap64(next, (end-start)*blksize, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
+#else
+        // Older versions of Android do not have mmap64 so we will just use mmap instead
+        void* addr = mmap(next, (end-start)*blksize, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
+#endif
         if (addr == MAP_FAILED) {
             LOGW("failed to map block %d: %s\n", i, strerror(errno));
             return -1;