diff --git a/library/poly1305.c b/library/poly1305.c
index 9e90d67b1a..1f35f1d501 100644
--- a/library/poly1305.c
+++ b/library/poly1305.c
@@ -61,7 +61,7 @@ static uint64_t mul64( uint32_t a, uint32_t b )
 {
     /* a = al + 2**16 ah, b = bl + 2**16 bh */
     const uint16_t al = (uint16_t) a;
-    const uint16_t bl = (uint16_t) b;    
+    const uint16_t bl = (uint16_t) b;
     const uint16_t ah = a >> 16;
     const uint16_t bh = b >> 16;