diff --git a/azo-sys/src/lib.rs b/azo-sys/src/lib.rs
index 576e3df..422e3f0 100644
--- a/azo-sys/src/lib.rs
+++ b/azo-sys/src/lib.rs
@@ -139,7 +139,7 @@ impl ResultCode {
     }
 }
 
-#[repr(C)]
+#[repr(C, packed(4))]
 #[derive(Debug, Clone, PartialEq)]
 pub struct TimeCode {
 	pub speed: c_double,
@@ -182,7 +182,7 @@ bitflags! {
 	}
 }
 
-#[repr(C)]
+#[repr(C, packed(4))]
 #[derive(Debug, Default, Clone, PartialEq)]
 pub struct TimeInfo {
 	pub speed          : c_double,
@@ -246,7 +246,7 @@ pub type BufferSwitchTimeInfo =
 		direct_process     : Bool
 	) -> *mut Time;
 
-#[repr(C)]
+#[repr(C, packed(4))]
 #[derive(Debug, Clone, Hash)]
 pub struct Callbacks {
     pub buffer_switch          : BufferSwitch,
@@ -359,7 +359,7 @@ pub struct ChannelInfo {
 	pub name         : [u8; 32]
 }
 
-#[repr(C)]
+#[repr(C, packed(4))]
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct BufferInfo {
 	pub is_input   : Bool,
diff --git a/azo-sys/src/utils.rs b/azo-sys/src/utils.rs
index f0c430a..95f5ed7 100644
--- a/azo-sys/src/utils.rs
+++ b/azo-sys/src/utils.rs
@@ -56,6 +56,7 @@ macro_rules! c_enum {
 	}
 }
 
+#[repr(C)]
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct I64Split {
 	pub hi: u32,