diff --git a/sumpy/tools.py b/sumpy/tools.py
index f7ef6c1c701600608d3adae2c3025272d27f38db..c9cd433f7f7f8e256e9b186d30b5fac520837313 100644
--- a/sumpy/tools.py
+++ b/sumpy/tools.py
@@ -200,11 +200,15 @@ class KernelCacheWrapper(object):
         from sumpy import code_cache, CACHING_ENABLED
 
         if CACHING_ENABLED:
+            from sumpy.version import SUMPY_KERNEL_VERSION
+
             import loopy.version
             cache_key = (
                     self.get_cache_key()
                     + tuple(sorted(kwargs.iteritems()))
-                    + (loopy.version.DATA_MODEL_VERSION,))
+                    + (loopy.version.DATA_MODEL_VERSION,
+                        SUMPY_KERNEL_VERSION,)
+                    )
 
             try:
                 result = code_cache[cache_key]
diff --git a/sumpy/version.py b/sumpy/version.py
index d311f19b4bad064bda0fe5e8a23365145faa80d9..e0f86a84f406d0cdd485ff962275357d34f64358 100644
--- a/sumpy/version.py
+++ b/sumpy/version.py
@@ -24,3 +24,5 @@ THE SOFTWARE.
 VERSION = (2014, 1)
 VERSION_STATUS = "beta1"
 VERSION_TEXT = ".".join(str(x) for x in VERSION) + VERSION_STATUS
+
+SUMPY_KERNEL_VERSION = 1