diff --git a/library/aes.c b/library/aes.c
index 07eaca925..38683ee33 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -69,12 +69,12 @@ static void polarssl_zeroize( void *v, size_t n ) {
 #endif
 
 #ifndef PUT_UINT32_LE
-#define PUT_UINT32_LE(n,b,i)                            \
-{                                                       \
-    (b)[(i)    ] = (unsigned char) ( (n)       );       \
-    (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
-    (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
-    (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
+#define PUT_UINT32_LE(n,b,i)                                    \
+{                                                               \
+    (b)[(i)    ] = (unsigned char) ( ( (n)       ) & 0xFF );    \
+    (b)[(i) + 1] = (unsigned char) ( ( (n) >>  8 ) & 0xFF );    \
+    (b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF );    \
+    (b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF );    \
 }
 #endif
 
diff --git a/library/md4.c b/library/md4.c
index 842420b2b..cf5f9a97b 100644
--- a/library/md4.c
+++ b/library/md4.c
@@ -67,12 +67,12 @@ static void polarssl_zeroize( void *v, size_t n ) {
 #endif
 
 #ifndef PUT_UINT32_LE
-#define PUT_UINT32_LE(n,b,i)                            \
-{                                                       \
-    (b)[(i)    ] = (unsigned char) ( (n)       );       \
-    (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
-    (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
-    (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
+#define PUT_UINT32_LE(n,b,i)                                    \
+{                                                               \
+    (b)[(i)    ] = (unsigned char) ( ( (n)       ) & 0xFF );    \
+    (b)[(i) + 1] = (unsigned char) ( ( (n) >>  8 ) & 0xFF );    \
+    (b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF );    \
+    (b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF );    \
 }
 #endif
 
diff --git a/library/md5.c b/library/md5.c
index fc8644922..a09bba3e6 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -66,12 +66,12 @@ static void polarssl_zeroize( void *v, size_t n ) {
 #endif
 
 #ifndef PUT_UINT32_LE
-#define PUT_UINT32_LE(n,b,i)                            \
-{                                                       \
-    (b)[(i)    ] = (unsigned char) ( (n)       );       \
-    (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
-    (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
-    (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
+#define PUT_UINT32_LE(n,b,i)                                    \
+{                                                               \
+    (b)[(i)    ] = (unsigned char) ( ( (n)       ) & 0xFF );    \
+    (b)[(i) + 1] = (unsigned char) ( ( (n) >>  8 ) & 0xFF );    \
+    (b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF );    \
+    (b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF );    \
 }
 #endif
 
diff --git a/library/ripemd160.c b/library/ripemd160.c
index c8433e736..a909cf7e7 100644
--- a/library/ripemd160.c
+++ b/library/ripemd160.c
@@ -64,12 +64,12 @@
 #endif
 
 #ifndef PUT_UINT32_LE
-#define PUT_UINT32_LE(n,b,i)                            \
-{                                                       \
-    (b)[(i)    ] = (unsigned char) ( (n)       );       \
-    (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
-    (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
-    (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
+#define PUT_UINT32_LE(n,b,i)                                    \
+{                                                               \
+    (b)[(i)    ] = (unsigned char) ( ( (n)       ) & 0xFF );    \
+    (b)[(i) + 1] = (unsigned char) ( ( (n) >>  8 ) & 0xFF );    \
+    (b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF );    \
+    (b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF );    \
 }
 #endif