diff --git a/src/flint/_flint.pxd b/src/flint/_flint.pxd
index d8eb3e16..c31026c8 100644
--- a/src/flint/_flint.pxd
+++ b/src/flint/_flint.pxd
@@ -969,8 +969,8 @@ cdef extern from "arb.h":
     void arb_get_ubound_arf(arf_t u, const arb_t z, long prec)
     void arb_get_lbound_arf(arf_t u, const arb_t z, long prec)
     void arb_nonnegative_part(arb_t u, const arb_t x)
-    long arb_rel_error_bits(const arb_t x)
-    long arb_rel_accuracy_bits(const arb_t x)
+    slong arb_rel_error_bits(const arb_t x)
+    slong arb_rel_accuracy_bits(const arb_t x)
     long arb_bits(const arb_t x)
     void arb_randtest_exact(arb_t x, flint_rand_t state, long prec, long mag_bits)
     void arb_randtest_wide(arb_t x, flint_rand_t state, long prec, long mag_bits)
diff --git a/src/flint/functions.pyx b/src/flint/functions.pyx
index fd19bd4f..86057f3d 100644
--- a/src/flint/functions.pyx
+++ b/src/flint/functions.pyx
@@ -24,8 +24,8 @@ cdef goodstr(x):
         return x.str(radius=False)
     raise TypeError("must have arb or acb")
 
-def good(func, long prec=0, long maxprec=0, long dps=0,
-        long maxdps=0, long padding=10, bint verbose=False, bint show=False, bint parts=True, metric=None):
+def good(func, slong prec=0, slong maxprec=0, slong dps=0,
+        slong maxdps=0, slong padding=10, bint verbose=False, bint show=False, bint parts=True, metric=None):
     """
     Evaluates *func*, automatically increasing the precision to get
     a result accurate to the current working precision (or the
@@ -53,7 +53,7 @@ def good(func, long prec=0, long maxprec=0, long dps=0,
 
 
     """
-    cdef long orig, morebits, acc
+    cdef slong orig, morebits, acc
 
     if dps > 0:
         prec = dps_to_prec(dps)