diff --git a/ruby/ql/lib/codeql/ruby/security/SqlInjectionQuery.qll b/ruby/ql/lib/codeql/ruby/security/SqlInjectionQuery.qll
index f74e919ffe5e..350eb5028e3b 100644
--- a/ruby/ql/lib/codeql/ruby/security/SqlInjectionQuery.qll
+++ b/ruby/ql/lib/codeql/ruby/security/SqlInjectionQuery.qll
@@ -15,7 +15,7 @@ class Configuration extends TaintTracking::Configuration {
 
   override predicate isSource(DataFlow::Node source) { source instanceof Source }
 
-  override predicate isSink(DataFlow::Node source) { source instanceof Sink }
+  override predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
 
   override predicate isSanitizer(DataFlow::Node node) { node instanceof Sanitizer }
 }
diff --git a/ruby/ql/lib/codeql/ruby/security/TemplateInjectionQuery.qll b/ruby/ql/lib/codeql/ruby/security/TemplateInjectionQuery.qll
index 827e582be6c8..2726f053b8cf 100644
--- a/ruby/ql/lib/codeql/ruby/security/TemplateInjectionQuery.qll
+++ b/ruby/ql/lib/codeql/ruby/security/TemplateInjectionQuery.qll
@@ -15,7 +15,7 @@ class Configuration extends TaintTracking::Configuration {
 
   override predicate isSource(DataFlow::Node source) { source instanceof Source }
 
-  override predicate isSink(DataFlow::Node source) { source instanceof Sink }
+  override predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
 
   override predicate isSanitizer(DataFlow::Node node) { node instanceof Sanitizer }
 }