diff --git a/pystencils/backends/cbackend.py b/pystencils/backends/cbackend.py
index a17ee7269bbb01aef673dc22c6432698d0c3cd5b..8437bdb6801ecc5adc717dec2983e5d6eda0baf0 100644
--- a/pystencils/backends/cbackend.py
+++ b/pystencils/backends/cbackend.py
@@ -441,7 +441,7 @@ class CustomSympyPrinter(CCodePrinter):
     def _print_Pow(self, expr):
         """Don't use std::pow function, for small integer exponents, write as multiplication"""
         if not expr.free_symbols:
-            return self._typed_number(expr.evalf(), get_type_of_expression(expr.base))
+            return self._typed_number(expr.evalf(17), get_type_of_expression(expr.base))
 
         if expr.exp.is_integer and expr.exp.is_number and 0 < expr.exp < 8:
             return f"({self._print(sp.Mul(*[expr.base] * expr.exp, evaluate=False))})"
@@ -452,7 +452,7 @@ class CustomSympyPrinter(CCodePrinter):
 
     def _print_Rational(self, expr):
         """Evaluate all rationals i.e. print 0.25 instead of 1.0/4.0"""
-        res = str(expr.evalf().num)
+        res = str(expr.evalf(17))
         return res
 
     def _print_Equality(self, expr):
diff --git a/pystencils/simp/simplifications.py b/pystencils/simp/simplifications.py
index 114b86a4013cccc3a74b641b0aabf747dbd3035d..720abb52ad0f66e030fa7b5f922b8ab0771124bd 100644
--- a/pystencils/simp/simplifications.py
+++ b/pystencils/simp/simplifications.py
@@ -234,7 +234,7 @@ def apply_sympy_optimisations(assignments):
 
     # Evaluates all constant terms
     evaluate_constant_terms = ReplaceOptim(lambda e: hasattr(e, 'is_constant') and e.is_constant and not e.is_integer,
-                                           lambda p: p.evalf())
+                                           lambda p: p.evalf(17))
 
     sympy_optimisations = [evaluate_constant_terms] + list(optims_c99)
 
diff --git a/pystencils_tests/test_types.py b/pystencils_tests/test_types.py
index 8fc260f42fad8f7d08afe93c6973d512930c138b..b6a7cd81cf8b7618ab69f6e0dd69094f93de3238 100644
--- a/pystencils_tests/test_types.py
+++ b/pystencils_tests/test_types.py
@@ -101,8 +101,9 @@ def test_sqrt_of_integer():
     kernel(f=arr_single)
 
     code = ps.get_code_str(kernel.ast)
-
-    assert "1.7320508075688772f" in code
+    # ps.show_code(kernel.ast)
+    # 1.7320508075688772935  --> it is actually correct to round to ...773. This was wrong before !282
+    assert "1.7320508075688773f" in code
     assert 1.7 < arr_single[0] < 1.8