diff --git a/src/filters/filter.h b/src/filters/filter.h
index 21dbd25..9530c4a 100644
--- a/src/filters/filter.h
+++ b/src/filters/filter.h
@@ -6,6 +6,8 @@
  */
 #include <stdbool.h>
 
+#define ID_MAX 32
+#define PATTERN_MAX 256
 #define HOST_TOKEN "<HOST>"
 
 typedef struct _config cfg_t;
diff --git a/src/filters/pcre.c b/src/filters/pcre.c
index 462faf6..a1df0e9 100644
--- a/src/filters/pcre.c
+++ b/src/filters/pcre.c
@@ -24,7 +24,7 @@ typedef struct f2b_regex_t {
 } f2b_regex_t;
 
 struct _config {
-  char id[32];
+  char id[ID_MAX];
   char error[256];
   bool icase;
   bool study;
diff --git a/src/filters/preg.c b/src/filters/preg.c
index b6e083a..3cc5efd 100644
--- a/src/filters/preg.c
+++ b/src/filters/preg.c
@@ -24,7 +24,7 @@ typedef struct f2b_regex_t {
 } f2b_regex_t;
 
 struct _config {
-  char id[32];
+  char id[ID_MAX];
   char error[256];
   bool icase;
   f2b_regex_t *regexps;