diff --git a/cpp/ql/src/JPL_C/LOC-4/Rule 20/PreprocessorUsePartial.ql b/cpp/ql/src/JPL_C/LOC-4/Rule 20/PreprocessorUsePartial.ql
index eed90414eb3..376f50962d6 100644
--- a/cpp/ql/src/JPL_C/LOC-4/Rule 20/PreprocessorUsePartial.ql	
+++ b/cpp/ql/src/JPL_C/LOC-4/Rule 20/PreprocessorUsePartial.ql	
@@ -12,7 +12,7 @@
 import cpp
 
 predicate incomplete(Macro m) {
-  exists(string body | body = m.getBody() and not m.getBody().matches("%\\") |
+  exists(string body | body = m.getBody() and not m.getBody().matches("%\\\\") |
     body.regexpMatch("[^(]*\\).*") or
     body.regexpMatch("[^\\[]*].*") or
     body.regexpMatch("[^{]*}.*") or
diff --git a/cpp/ql/src/Power of 10/Rule 8/PartialMacro.ql b/cpp/ql/src/Power of 10/Rule 8/PartialMacro.ql
index 2598118805c..7abc0b2f669 100644
--- a/cpp/ql/src/Power of 10/Rule 8/PartialMacro.ql	
+++ b/cpp/ql/src/Power of 10/Rule 8/PartialMacro.ql	
@@ -12,7 +12,7 @@
 import cpp
 
 predicate incomplete(Macro m) {
-  exists(string body | body = m.getBody() and not m.getBody().matches("%\\") |
+  exists(string body | body = m.getBody() and not m.getBody().matches("%\\\\") |
     body.regexpMatch("[^(]*\\).*") or
     body.regexpMatch("[^\\[]*].*") or
     body.regexpMatch("[^{]*}.*") or