diff --git a/src/lte/CMakeLists.txt b/src/lte/CMakeLists.txt
index 91911b255..d08be8e88 100644
--- a/src/lte/CMakeLists.txt
+++ b/src/lte/CMakeLists.txt
@@ -2,21 +2,25 @@ set(emu_sources)
 set(emu_headers)
 set(emu_features)
 set(emu_libraries)
-if(${ENABLE_EMU}
-   AND ${ENABLE_EMUNETDEV}
+if(DEFINED
+   ENABLE_EMUNETDEV
 )
-  set(emu_sources
-      helper/emu-epc-helper.cc
-  )
-  set(emu_headers
-      helper/emu-epc-helper.h
-  )
-  set(emu_features
-      EmuFdNetDevice
-  )
-  set(emu_libraries
-      ${libfd-net-device}
+  if(${ENABLE_EMU}
+     AND ${ENABLE_EMUNETDEV}
   )
+    set(emu_sources
+        helper/emu-epc-helper.cc
+    )
+    set(emu_headers
+        helper/emu-epc-helper.h
+    )
+    set(emu_features
+        EmuFdNetDevice
+    )
+    set(emu_libraries
+        ${libfd-net-device}
+    )
+  endif()
 endif()
 
 set(source_files
diff --git a/src/lte/examples/CMakeLists.txt b/src/lte/examples/CMakeLists.txt
index 525502e76..adcaa0b61 100644
--- a/src/lte/examples/CMakeLists.txt
+++ b/src/lte/examples/CMakeLists.txt
@@ -36,15 +36,19 @@ foreach(
   )
 endforeach()
 
-if(${ENABLE_EMU}
-   AND ${ENABLE_EMUNETDEV}
+if(DEFINED
+   ENABLE_EMUNETDEV
 )
-  build_lib_example(
-    NAME lena-simple-epc-emu
-    SOURCE_FILES lena-simple-epc-emu.cc
-    LIBRARIES_TO_LINK
-      ${liblte}
-      ${libfd-net-device}
-      ${libconfig-store}
+  if(${ENABLE_EMU}
+     AND ${ENABLE_EMUNETDEV}
   )
+    build_lib_example(
+      NAME lena-simple-epc-emu
+      SOURCE_FILES lena-simple-epc-emu.cc
+      LIBRARIES_TO_LINK
+        ${liblte}
+        ${libfd-net-device}
+        ${libconfig-store}
+    )
+  endif()
 endif()