diff --git a/addons/misra.py b/addons/misra.py
index 28b879807..2b2bea867 100755
--- a/addons/misra.py
+++ b/addons/misra.py
@@ -3215,6 +3215,16 @@ class MisraChecker:
             if cond.result and cond.result not in (0,1):
                 self.reportError(cond, 20, 8)
 
+    def misra_20_9(self, cfg):
+        for cond in cfg.preprocessor_if_conditions:
+            if cond.E is None:
+                continue
+            for s in cond.E.split(' '):
+                if (s[0] >= 'A' and s[0] <= 'Z') or (s[0] >= 'a' and s[0] <= 'z'):
+                    if isKeyword(s):
+                        continue
+                    self.reportError(cond, 20, 9)
+
     def misra_20_10(self, data):
         for directive in data.directives:
             d = Define(directive)
@@ -3892,6 +3902,7 @@ class MisraChecker:
             self.executeCheck(2005, self.misra_20_5, cfg)
             self.executeCheck(2007, self.misra_20_7, cfg)
             self.executeCheck(2008, self.misra_20_8, cfg)
+            self.executeCheck(2009, self.misra_20_9, cfg)
             self.executeCheck(2010, self.misra_20_10, cfg)
             self.executeCheck(2013, self.misra_20_13, cfg)
             self.executeCheck(2014, self.misra_20_14, cfg)
diff --git a/addons/test/misra/misra-test.c b/addons/test/misra/misra-test.c
index c623b4697..e83208a84 100644
--- a/addons/test/misra/misra-test.c
+++ b/addons/test/misra/misra-test.c
@@ -1231,11 +1231,11 @@ static void misra_15_6(void) {
   if (x!=0); // 15.6
   else{}
 
-#if A>1  // no-warning
+#if A>1  // 20.9
   (void)0;
 #endif
 
-#if A > 0x42
+#if A > 0x42 // 20.9
   if (true) {
     (void)0;
   }
@@ -1559,13 +1559,19 @@ struct { int a; } struct_20_7_s;
 #define MUL(a  ,b ) ( a * b ) // 20.7
 
 #if __LINE__  // 20.8
+#elif 2+5  // 20.8
+#elif 2-2
+#endif
+
+#if A // 20.9
+#elif B || C // 20.9
 #endif
 
 #define M_20_10(a) (#a) // 20.10
 
 #else1 // 20.13
 
-#ifdef A>1
+#ifdef A
 # define somethingis 5 // no warning
 # define func_20_13(v) (v) // no warning
 #else