diff --git a/Modules/getpath.c b/Modules/getpath.c
index 9653d3e898c..f28f4c6ddff 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -471,7 +471,7 @@ calculate_path(void)
         if (!ismodule(argv0_path)) {
                 /* We are in the build directory so use the name of the
                    executable - we know that the absolute path is passed */
-                strncpy(argv0_path, prog, MAXPATHLEN);
+                strncpy(argv0_path, progpath, MAXPATHLEN);
         }
         else {
                 /* Use the location of the library as the progpath */