diff --git a/steam-runtime-tools/graphics.c b/steam-runtime-tools/graphics.c
index 3aeaa10054ec98dc53f05f363a78c63a854dd685..615744918f0c57151b8741a9f262ead338cfff8f 100644
--- a/steam-runtime-tools/graphics.c
+++ b/steam-runtime-tools/graphics.c
@@ -1706,7 +1706,7 @@ _srt_load_egl_icds (gchar **envp,
    * https://github.com/NVIDIA/libglvnd/blob/master/src/EGL/icd_enumeration.md
    * for details of the search order. */
 
-  sysroot = g_environ_getenv (envp, "SRT_TEST_ICD_SYSROOT");
+  sysroot = g_environ_getenv (envp, "SRT_TEST_SYSROOT");
   value = g_environ_getenv (envp, "__EGL_VENDOR_LIBRARY_FILENAMES");
 
   if (value != NULL)
@@ -2282,7 +2282,7 @@ _srt_load_vulkan_icds (gchar **envp,
    * documentation is not completely up to date (as of September 2019)
    * so you should also look at the reference implementation. */
 
-  sysroot = g_environ_getenv (envp, "SRT_TEST_ICD_SYSROOT");
+  sysroot = g_environ_getenv (envp, "SRT_TEST_SYSROOT");
   value = g_environ_getenv (envp, "VK_ICD_FILENAMES");
 
   if (value != NULL)
diff --git a/tests/graphics.c b/tests/graphics.c
index 7199c5369049cb00ef4b8bd86a2a1a7c59c60c2d..f94020b9cf00e3e7943047dddc99164b1737fc4c 100644
--- a/tests/graphics.c
+++ b/tests/graphics.c
@@ -84,7 +84,7 @@ setup (Fixture *f,
     {
       tmp = g_build_filename (f->srcdir, "fake-icds", NULL);
       f->fake_icds_envp = g_environ_setenv (f->fake_icds_envp,
-                                            "SRT_TEST_ICD_SYSROOT", tmp, TRUE);
+                                            "SRT_TEST_SYSROOT", tmp, TRUE);
       g_free (tmp);
     }