diff --git a/addons/misra-test.c b/addons/misra-test.c
index cf9683f68..1e85dde82 100644
--- a/addons/misra-test.c
+++ b/addons/misra-test.c
@@ -17,8 +17,8 @@ void misra_5_1() {
   int a1234567890123456789012345678901; // 5.1
 }
 
-#define m54_12345678901234567890123456     1 // no-warning
-#define m54_1234567890123456789012345678   2 // 5.4
+#define m54_123456789012345678901234567890123456789012345678901234567890    1 // 5.4
+#define m54_1234567890123456789012345678901234567890123456789012345678901   2 // 5.4
 
 #define m55(x,y) (x+y)
 int m55; // 5.5
diff --git a/addons/misra.py b/addons/misra.py
index 48187392a..030489d53 100644
--- a/addons/misra.py
+++ b/addons/misra.py
@@ -275,7 +275,7 @@ def misra_5_1(data):
 
 def misra_5_4(data):
     for dir in data.directives:
-        if re.match(r'#define [a-zA-Z0-9_]{32,}', dir.str):
+        if re.match(r'#define [a-zA-Z0-9_]{64,}', dir.str):
             reportError(dir, 5, 4)
 
 def misra_5_5(data):