diff --git a/src/irpf90_t.py b/src/irpf90_t.py
index b43ca09..7ff70c0 100644
--- a/src/irpf90_t.py
+++ b/src/irpf90_t.py
@@ -29,7 +29,7 @@ from zlib import crc32
 
 irpdir = "IRPF90_temp/"
 mandir = "IRPF90_man/"
-irp_id = crc32(os.getcwd())
+irp_id = abs(crc32(os.getcwd()))
 
 
 class Line(object):
diff --git a/src/version.py b/src/version.py
index 91e96cd..7264fb1 100644
--- a/src/version.py
+++ b/src/version.py
@@ -1 +1 @@
-version = "1.1.74"
+version = "1.1.75"