diff --git a/library/padlock.c b/library/padlock.c
index f4d95fd..d83f76c 100644
--- a/library/padlock.c
+++ b/library/padlock.c
@@ -104,7 +104,7 @@
          "movl    %1, %%ebx             \n\t"
          : "=m" (ebx)
          :  "m" (ebx), "m" (ctrl), "m" (rk), "m" (blk)
-         : "ecx", "edx", "esi", "edi" );
+         : "memory", "ecx", "edx", "esi", "edi" );
 
     memcpy( output, blk, 16 );
 
@@ -155,7 +155,7 @@
          : "=m" (ebx)
          :  "m" (ebx), "m" (count), "m" (ctrl),
             "m"  (rk), "m" (input), "m" (output), "m" (iw)
-         : "eax", "ecx", "edx", "esi", "edi" );
+         : "memory", "eax", "ecx", "edx", "esi", "edi" );
 
     memcpy( iv, iw, 16 );