diff --git a/sakia.spec b/sakia.spec
index ce89641b01ca0d42495381eed6e673b98ecee69c..ade05c39b1af424e6225648950212d045bf470ed 100644
--- a/sakia.spec
+++ b/sakia.spec
@@ -32,10 +32,8 @@ if is_darwin:
 if is_linux:
     libsodium_path = ctypes.util.find_library('libsodium.so')
     if not libsodium_path:
-        for soname in (13, 10, 5, 4):
-            libsodium_path = ctypes.util.find_library('libsodium.so.{0}'.format(soname))
-            if libsodium_path:
-                break
+        if os.path.isfile('/usr/lib/x86_64-linux-gnu/libsodium.so.13'):
+            libsodium_path = "/usr/lib/x86_64-linux-gnu/libsodium.so.13"
 
     a.binaries = a.binaries + TOC([('libsodium.so', libsodium_path, 'BINARY')])