diff --git a/src/libutil/windows/include/nix/util/signals-impl.hh b/src/libutil/windows/include/nix/util/signals-impl.hh
index f716ffd1a..55606debd 100644
--- a/src/libutil/windows/include/nix/util/signals-impl.hh
+++ b/src/libutil/windows/include/nix/util/signals-impl.hh
@@ -25,6 +25,7 @@ inline void setInterruptThrown()
 static inline bool isInterrupted()
 {
     /* Do nothing for now */
+    return false;
 }
 
 inline void checkInterrupt()