diff --git a/sumpy/kernel.py b/sumpy/kernel.py
index c4544ef5..a9d83f9f 100644
--- a/sumpy/kernel.py
+++ b/sumpy/kernel.py
@@ -149,6 +149,7 @@ class Kernel:
     .. automethod:: get_global_scaling_const
     .. automethod:: get_args
     .. automethod:: get_source_args
+    .. automethod:: get_pde_as_diff_op
     """
 
     if TYPE_CHECKING:
@@ -622,7 +623,7 @@ def __init__(self, dim, yukawa_lambda_name="lam"):
             expr = var("hankel_1")(0, var("I")*lam*r)
             scaling_for_K0 = var("pi")/2*var("I")       # noqa: N806
 
-            scaling = -1/(2*var("pi")) * scaling_for_K0
+            scaling = 1/(2*var("pi")) * scaling_for_K0
         elif dim == 3:
             # NOTE: to get the expression, we do the following and simplify
             # 1. express K(1/2, lam r) as a modified spherical Bessel function
@@ -630,7 +631,7 @@ def __init__(self, dim, yukawa_lambda_name="lam"):
             # 2. or use (AS 10.2.17) directly
             expr = var("exp")(-lam*r) / r
 
-            scaling = -1/(4 * var("pi")**2)
+            scaling = 1/(4 * var("pi"))
         else:
             raise RuntimeError("unsupported dimensionality")
 
diff --git a/sumpy/version.py b/sumpy/version.py
index 81d1e3c7..8c4f151f 100644
--- a/sumpy/version.py
+++ b/sumpy/version.py
@@ -41,4 +41,4 @@ def _parse_version(version: str) -> tuple[tuple[int, ...], str]:
 VERSION, VERSION_STATUS = _parse_version(VERSION_TEXT)
 
 _GIT_REVISION = find_module_git_revision(__file__, n_levels_up=1)
-KERNEL_VERSION = (*VERSION, _GIT_REVISION, 0)
+KERNEL_VERSION = (*VERSION, _GIT_REVISION, 1)