diff --git a/java/ql/lib/semmle/code/java/controlflow/Guards.qll b/java/ql/lib/semmle/code/java/controlflow/Guards.qll
index c33658cb67b..778ebe6e878 100644
--- a/java/ql/lib/semmle/code/java/controlflow/Guards.qll
+++ b/java/ql/lib/semmle/code/java/controlflow/Guards.qll
@@ -490,12 +490,6 @@ module Guards_v2 = GuardsImpl::Logic<LogicInput_v2>;
 /** INTERNAL: Don't use. */
 module Guards_v3 = GuardsImpl::Logic<LogicInput_v3>;
 
-/** INTERNAL: Don't use. */
-predicate implies_v3(Guard g1, boolean b1, Guard g2, boolean b2) {
-  Guards_v3::boolImplies(g1, any(GuardValue v | v.asBooleanValue() = b1), g2,
-    any(GuardValue v | v.asBooleanValue() = b2))
-}
-
 /**
  * A guard. This may be any expression whose value determines subsequent
  * control flow. It may also be a switch case, which as a guard is considered
diff --git a/shared/controlflow/codeql/controlflow/Guards.qll b/shared/controlflow/codeql/controlflow/Guards.qll
index 7a643fce9e7..ab500456058 100644
--- a/shared/controlflow/codeql/controlflow/Guards.qll
+++ b/shared/controlflow/codeql/controlflow/Guards.qll
@@ -935,18 +935,6 @@ module Make<LocationSig Location, InputSig<Location> Input> {
       }
     }
 
-    private predicate booleanGuard(Guard guard, GuardValue val) {
-      exists(guard) and exists(val.asBooleanValue())
-    }
-
-    private module BooleanImplies = ImpliesTC<booleanGuard/2>;
-
-    /** INTERNAL: Don't use. */
-    predicate boolImplies(Guard g1, GuardValue v1, Guard g2, GuardValue v2) {
-      BooleanImplies::guardControls(g2, v2, g1, v1) and
-      g2 != g1
-    }
-
     /**
      * Holds if `guard` evaluating to `v` implies that `e` is guaranteed to be
      * null if `isNull` is true, and non-null if `isNull` is false.