diff --git a/kpack_c.c b/kpack_c.c
index e0a296f..2d7f2d8 100644
--- a/kpack_c.c
+++ b/kpack_c.c
@@ -60,7 +60,7 @@ unsigned preprocess_calltrick(unsigned char *infile, unsigned insize, unsigned c
     do {
         //printf("infile_ptr = %p, count = %u\n", infile_ptr, count);
         unsigned al = *(infile_ptr++);
-        al -= 0x0E8;
+        al -= 0x0E8; // relative call opcode
         if (al > 1) {
             continue;
         }
@@ -82,8 +82,7 @@ unsigned preprocess_calltrick(unsigned char *infile, unsigned insize, unsigned c
             memcpy(buf_ptr, &infile_ptr, sizeof(buf_ptr));
             buf_ptr += sizeof(buf_ptr);
         }
-        
-    } while(count > 0);
+    } while(--count > 0);
 
     unsigned idx = 0;
     while (idx < 256 && ct1[idx] != 0) {