diff --git a/mielib/mieacoustics.py b/mielib/mieacoustics.py
index 35c8674..1d5cd45 100644
--- a/mielib/mieacoustics.py
+++ b/mielib/mieacoustics.py
@@ -77,8 +77,8 @@ def acoustics_pressure_cross_section(k, a, rho_rel, beta_rel, nmin=0, nmax=50, n
     sigma_pr_n = np.zeros([nmax, ka.size])
     
     for n in range(nmin, nmax):
-        an = mielib.acoustics_mie_a(n, ka, rho_rel, beta_rel)
-        an_plus1 = mielib.acoustics_mie_a(n+1, ka, rho_rel, beta_rel)
+        an = acoustics_mie_a(n, ka, rho_rel, beta_rel)
+        an_plus1 = acoustics_mie_a(n+1, ka, rho_rel, beta_rel)
         if n == nmax-1:
             # to ensure that pressure cross section is always positive
             sigma_pr_n[n, :] = -4*np.pi / k**2 * (2*n+1) * np.real(an)  
diff --git a/pyproject.toml b/pyproject.toml
index 9ca7bc4..4129e87 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "mielib"
-version = "0.1.11"
+version = "0.1.12"
 description = "Python library with many Mie-related functions for optics and acoustics"
 authors = ["Ivan Toftul <toftul.ivan@gmail.com>"]
 readme = "README.md"