diff --git a/capa/features/extractors/cape/process.py b/capa/features/extractors/cape/process.py
index 2119cef1..e94c43dd 100644
--- a/capa/features/extractors/cape/process.py
+++ b/capa/features/extractors/cape/process.py
@@ -44,9 +44,8 @@ def extract_environ_strings(behavior: Dict, ph: ProcessHandle) -> Iterator[Tuple
     if not environ:
         return
 
-    for _, value in environ.items():
-        if value:
-            yield String(value), ph.address
+    for value in (value for value in environ.values() if value):
+        yield String(value), ph.address
 
 
 def extract_features(behavior: Dict, ph: ProcessHandle) -> Iterator[Tuple[Feature, Address]]: