diff --git a/src/core/ddsi/src/q_config.c b/src/core/ddsi/src/q_config.c
index bf1781d..f3ea0a7 100644
--- a/src/core/ddsi/src/q_config.c
+++ b/src/core/ddsi/src/q_config.c
@@ -33,7 +33,6 @@
 #include "dds/ddsi/q_error.h"
 
 #include "dds/ddsrt/xmlparser.h"
-#include "dds/ddsrt/expand_envvars.h"
 
 #include "dds/version.h"
 
diff --git a/src/ddsrt/CMakeLists.txt b/src/ddsrt/CMakeLists.txt
index 5b49248..cda6f18 100644
--- a/src/ddsrt/CMakeLists.txt
+++ b/src/ddsrt/CMakeLists.txt
@@ -79,7 +79,6 @@ list(APPEND sources
 
 list(APPEND headers
   "${source_path}/dds/ddsrt/avl.h"
-  "${source_path}/dds/ddsrt/expand_envvars.h"
   "${source_path}/dds/ddsrt/fibheap.h"
   "${source_path}/dds/ddsrt/hopscotch.h"
   "${source_path}/dds/ddsrt/thread_pool.h")
diff --git a/src/ddsrt/include/dds/ddsrt/expand_envvars.h b/src/ddsrt/include/dds/ddsrt/expand_envvars.h
deleted file mode 100644
index d7b66f4..0000000
--- a/src/ddsrt/include/dds/ddsrt/expand_envvars.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * Copyright(c) 2006 to 2018 ADLINK Technology Limited and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License v. 2.0 which is available at
- * http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
- * v. 1.0 which is available at
- * http://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
- */
-#ifndef DDSRT_EXPAND_ENVVARS_H
-#define DDSRT_EXPAND_ENVVARS_H
-
-#include "dds/export.h"
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-    /* Expands ${X}, ${X:-Y}, ${X:+Y}, ${X:?Y} forms, but not $X */
-    DDS_EXPORT char *ddsrt_expand_envvars(const char *string);
-
-    /* Expands $X, ${X}, ${X:-Y}, ${X:+Y}, ${X:?Y} forms, $ and \ can be escaped with \ */
-    DDS_EXPORT char *ddsrt_expand_envvars_sh(const char *string);
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif
diff --git a/src/ddsrt/src/expand_envvars.c b/src/ddsrt/src/expand_envvars.c
index ded0d0a..dbaa33a 100644
--- a/src/ddsrt/src/expand_envvars.c
+++ b/src/ddsrt/src/expand_envvars.c
@@ -19,7 +19,6 @@
 #include "dds/ddsrt/heap.h"
 #include "dds/ddsrt/log.h"
 #include "dds/ddsrt/string.h"
-#include "dds/ddsrt/expand_envvars.h"
 
 typedef char * (*expand_fn)(const char *src0);