diff --git a/configure.ac b/configure.ac
index f34b9d466c0..50d86b30c27 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,9 +7,9 @@ AC_CONFIG_SRCDIR(src/clib/pio_darray.c)
 AM_INIT_AUTOMAKE([foreign serial-tests])
 
 # The PIO version, again.
-AC_DEFINE([VERSION_MAJOR], [2], [PIO major version])
-AC_DEFINE([VERSION_MINOR], [4], [PIO minor version])
-AC_DEFINE([VERSION_PATCH], [1], [PIO patch version])
+AC_DEFINE([PIO_VERSION_MAJOR], [2], [PIO major version])
+AC_DEFINE([PIO_VERSION_MINOR], [4], [PIO minor version])
+AC_DEFINE([PIO_VERSION_PATCH], [1], [PIO patch version])
 
 # Once more for the documentation.
 AC_SUBST([VERSION_MAJOR], [2])
diff --git a/src/clib/pioc_support.c b/src/clib/pioc_support.c
index 2d1680dd294..ecf52c862a5 100644
--- a/src/clib/pioc_support.c
+++ b/src/clib/pioc_support.c
@@ -1231,7 +1231,7 @@ int pioc_write_nc_decomp_int(iosystem_desc_t *ios, const char *filename, int cmo
 
     /* Write an attribute with the version of this file. */
     char version[PIO_MAX_NAME + 1];
-    sprintf(version, "%d.%d.%d", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH);
+    sprintf(version, "%d.%d.%d", PIO_VERSION_MAJOR, PIO_VERSION_MINOR, PIO_VERSION_PATCH);
     if ((ret = PIOc_put_att_text(ncid, NC_GLOBAL, DECOMP_VERSION_ATT_NAME,
                                  strlen(version) + 1, version)))
         return pio_err(ios, NULL, ret, __FILE__, __LINE__);