diff --git a/src/decode.rs b/src/decode.rs
index fd12d6b..21a1e64 100644
--- a/src/decode.rs
+++ b/src/decode.rs
@@ -57,7 +57,7 @@ impl Instruction {
 
     #[inline]
     pub fn imm_s(self) -> DWord {
-        (self.0 as i32 as i64 >> (25 - 5) & (0x7f << 5)) as DWord | (self.0 >> 7 & 0b1111) as DWord
+        (self.0 as i32 as i64 >> (25 - 5) & (0x7f << 5)) as DWord | (self.0 >> 7 & 0b11111) as DWord
     }
 
     #[inline]