diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
index 1359d33f77..0d29aa03a0 100644
--- a/bitbake/lib/bb/cooker.py
+++ b/bitbake/lib/bb/cooker.py
@@ -159,6 +159,9 @@ class BBCooker:
             for f in featureSet:
                 self.featureset.setFeature(f)
 
+        self.orig_syspath = sys.path.copy()
+        self.orig_sysmodules = [*sys.modules]
+
         self.configuration = bb.cookerdata.CookerConfiguration()
 
         self.idleCallBackRegister = idleCallBackRegister
@@ -350,6 +353,11 @@ class BBCooker:
         self.state = state.initial
         self.caches_array = []
 
+        sys.path = self.orig_syspath.copy()
+        for mod in [*sys.modules]:
+            if mod not in self.orig_sysmodules:
+                del sys.modules[mod]
+
         # Need to preserve BB_CONSOLELOG over resets
         consolelog = None
         if hasattr(self, "data"):