diff --git a/CMakeLists.txt b/CMakeLists.txt
index cca562a8637fed46b8236273e2939d9db487b82f..8047520391cb75d3f46acad5c87a720414f3c040 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -253,6 +253,8 @@ set(PUGS_HAS_SLURM ${SLURM_FOUND})
 
 if (${SLURM_FOUND})
   include_directories(SYSTEM "${SLURM_INCLUDE_DIR}")
+else()
+  set(SLURM_LIBRARY "")
 endif()
 
 #------------------------------------------------------