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-rw-r--r--idlc/source/astinterface.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/idlc/source/astinterface.cxx b/idlc/source/astinterface.cxx
index 4a368a8e3408..ebd254bc613f 100644
--- a/idlc/source/astinterface.cxx
+++ b/idlc/source/astinterface.cxx
@@ -304,7 +304,7 @@ void AstInterface::checkInheritedInterfaceClashes(
return;
case INTERFACE_DIRECT_MANDATORY:
- if (direct || !optional && !mainOptional) {
+ if (direct || (!optional && !mainOptional)) {
doubleDeclarations.interfaces.push_back(ifc);
}
return;