diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ea212c9d1..48ae22b08 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -40,6 +40,12 @@ repos:
       - id: ruff
         args: ["--fix", "--show-fixes"]
 
+  - repo: https://github.com/MarcoGorelli/cython-lint
+    rev: v0.15.0
+    hooks:
+      - id: cython-lint
+      - id: double-quote-cython-strings
+
   - repo: https://github.com/psf/black
     rev: "23.7.0"
     hooks:
diff --git a/pyproject.toml b/pyproject.toml
index d2ce8fdda..54f7f970e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -129,6 +129,8 @@ exclude = [
 [tool.ruff.extend-per-file-ignores]
 "tests/*.py" = ["S101"]  # Turn off assert error for test files
 
+[tool.cython-lint]
+max-line-length = 88
 
 [tool.repo-review]
 ignore = ["MY", "PC140", "GH200", "GH210", "GH211"]
diff --git a/src/stcal/ramp_fitting/ols_cas22.pyx b/src/stcal/ramp_fitting/ols_cas22.pyx
index a57960b1c..820fae570 100644
--- a/src/stcal/ramp_fitting/ols_cas22.pyx
+++ b/src/stcal/ramp_fitting/ols_cas22.pyx
@@ -13,7 +13,6 @@ cdef int PTABLE_LENGTH = 6
 
 
 cdef inline float get_weight_power(float s):
-    cdef int ise
     for i in range(PTABLE_LENGTH):
         if s < PTABLE[0][i]:
             return PTABLE[1][i - 1]
@@ -87,8 +86,8 @@ cdef inline (float, float, float) fit_one_ramp(
         for i in range(nres):
             # Casertano+22, Eq. 45
             ww[i] = ((((1 + weight_power) * nn[start + i]) /
-                (1 + weight_power * nn[start + i])) *
-                fabs((tbar[start + i] - tbarmid) / tscale) ** weight_power)
+                      (1 + weight_power * nn[start + i])) *
+                     fabs((tbar[start + i] - tbarmid) / tscale) ** weight_power)
             # Casertano+22 Eq. 35
             f0 += ww[i]
             f1 += ww[i] * tbar[start + i]
@@ -160,21 +159,22 @@ def fit_ramps(np.ndarray[float, ndim=2] resultants,
     """
     cdef int nresultant = len(ma_table)
     if nresultant != resultants.shape[0]:
-        raise RuntimeError(f'MA table length {nresultant} does not match number of resultants {resultants.shape[0]}')
+        raise RuntimeError(f"MA table length {nresultant} does not match "
+                           f"number of resultants {resultants.shape[0]}")
 
-    cdef np.ndarray[int] nn = np.array([x[1] for x in ma_table]).astype('i4')
+    cdef np.ndarray[int] nn = np.array([x[1] for x in ma_table]).astype("i4")
     # number of reads in each resultant
-    cdef np.ndarray[float] tbar = ma_table_to_tbar(ma_table, read_time).astype('f4')
-    cdef np.ndarray[float] tau = ma_table_to_tau(ma_table, read_time).astype('f4')
+    cdef np.ndarray[float] tbar = ma_table_to_tbar(ma_table, read_time).astype("f4")
+    cdef np.ndarray[float] tau = ma_table_to_tau(ma_table, read_time).astype("f4")
     cdef int npixel = resultants.shape[1]
     cdef int nramp = (np.sum(dq[0, :] == 0) +
                       np.sum((dq[:-1, :] != 0) & (dq[1:, :] == 0)))
-    cdef np.ndarray[float] slope = np.zeros(nramp, dtype='f4')
-    cdef np.ndarray[float] slopereadvar = np.zeros(nramp, dtype='f4')
-    cdef np.ndarray[float] slopepoissonvar = np.zeros(nramp, dtype='f4')
-    cdef np.ndarray[int] resstart = np.zeros(nramp, dtype='i4') - 1
-    cdef np.ndarray[int] resend = np.zeros(nramp, dtype='i4') - 1
-    cdef np.ndarray[int] pix = np.zeros(nramp, dtype='i4') - 1
+    cdef np.ndarray[float] slope = np.zeros(nramp, dtype="f4")
+    cdef np.ndarray[float] slopereadvar = np.zeros(nramp, dtype="f4")
+    cdef np.ndarray[float] slopepoissonvar = np.zeros(nramp, dtype="f4")
+    cdef np.ndarray[int] resstart = np.zeros(nramp, dtype="i4") - 1
+    cdef np.ndarray[int] resend = np.zeros(nramp, dtype="i4") - 1
+    cdef np.ndarray[int] pix = np.zeros(nramp, dtype="i4") - 1
     cdef int i, j
     cdef int inramp = -1
     cdef int rampnum = 0
@@ -194,7 +194,7 @@ def fit_ramps(np.ndarray[float, ndim=2] resultants,
                 resend[rampnum] = j - 1
                 rampnum += 1
             else:
-                raise ValueError('unhandled case')
+                raise ValueError("unhandled case")
         if inramp:
             resend[rampnum] = j
             rampnum += 1