diff --git a/src/oc/fileio.cpp b/src/oc/fileio.cpp
index 8002ce846c..140b53eed0 100644
--- a/src/oc/fileio.cpp
+++ b/src/oc/fileio.cpp
@@ -750,7 +750,7 @@ void hoc_Chdir(void) {
 }
 
 int nrn_is_python_extension;
-static int (*nrnpy_pr_stdoe_callback)(int, char*);
+int (*nrnpy_pr_stdoe_callback)(int, char*);
 static int (*nrnpy_pass_callback)();
 
 extern "C" void nrnpy_set_pr_etal(int (*cbpr_stdoe)(int, char*), int (*cbpass)()) {