1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/ndpi_define.h.in b/src/include/ndpi_define.h.in
index be7c21175..13989a60e 100644
--- a/src/include/ndpi_define.h.in
+++ b/src/include/ndpi_define.h.in
@@ -277,7 +277,7 @@
 #define NDPI_SET_BIT(num, n)    num |= 1UL << n
 #define NDPI_CLR_BIT(num, n)    num &= ~(1UL << n)
 #define NDPI_CLR_BIT(num, n)    num &= ~(1UL << n)
-#define NDPI_ISSET_BIT(num, n)  (num & (1 << n))
+#define NDPI_ISSET_BIT(num, n)  (num & (1UL << n))
 #define NDPI_ZERO_BIT(num)      num = 0
 
 /* this is a very very tricky macro *g*,