diff --git a/librocksdb-sys/build.rs b/librocksdb-sys/build.rs
index 48af659..5eb0c27 100644
--- a/librocksdb-sys/build.rs
+++ b/librocksdb-sys/build.rs
@@ -147,7 +147,18 @@ fn build_rocksdb() {
         lib_sources.push("util/crc32c_arm64.cc")
     }
 
-    if target.contains("darwin") {
+    if target.contains("apple-ios") {
+        config.define("OS_MACOSX", None);
+
+        config.define("IOS_CROSS_COMPILE", None);
+        config.define("PLATFORM", "IOS");
+        config.define("NIOSTATS_CONTEXT", None);
+        config.define("NPERF_CONTEXT", None);
+        config.define("ROCKSDB_PLATFORM_POSIX", None);
+        config.define("ROCKSDB_LIB_IO_POSIX", None);
+
+        env::set_var("IPHONEOS_DEPLOYMENT_TARGET", "11.0");
+    } else if target.contains("darwin") {
         config.define("OS_MACOSX", None);
         config.define("ROCKSDB_PLATFORM_POSIX", None);
         config.define("ROCKSDB_LIB_IO_POSIX", None);
diff --git a/src/db.rs b/src/db.rs
index 9b4d3b5..83c564d 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -992,20 +992,20 @@ impl<T: ThreadMode> DBWithThreadMode<T> {
     }
 
     /// Return the values associated with the given keys and column families.
-    pub fn multi_get_cf<'a, 'b: 'a, K, I, W: 'b>(
+    pub fn multi_get_cf<'a, 'b: 'a, K, I, W>(
         &'a self,
         keys: I,
     ) -> Vec<Result<Option<Vec<u8>>, Error>>
     where
         K: AsRef<[u8]>,
         I: IntoIterator<Item = (&'b W, K)>,
-        W: AsColumnFamilyRef,
+        W: 'b + AsColumnFamilyRef,
     {
         self.multi_get_cf_opt(keys, &ReadOptions::default())
     }
 
     /// Return the values associated with the given keys and column families using read options.
-    pub fn multi_get_cf_opt<'a, 'b: 'a, K, I, W: 'b>(
+    pub fn multi_get_cf_opt<'a, 'b: 'a, K, I, W>(
         &'a self,
         keys: I,
         readopts: &ReadOptions,
@@ -1013,7 +1013,7 @@ impl<T: ThreadMode> DBWithThreadMode<T> {
     where
         K: AsRef<[u8]>,
         I: IntoIterator<Item = (&'b W, K)>,
-        W: AsColumnFamilyRef,
+        W: 'b + AsColumnFamilyRef,
     {
         let (cfs_and_keys, keys_sizes): (Vec<(_, Box<[u8]>)>, Vec<_>) = keys
             .into_iter()