diff --git a/run-as/run-as.c b/run-as/run-as.c
index 3f32e7d..f0fd2fe 100644
--- a/run-as/run-as.c
+++ b/run-as/run-as.c
@@ -20,6 +20,8 @@
 
 #include <dirent.h>
 #include <errno.h>
+#include <paths.h>
+#include <pwd.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -193,10 +195,21 @@
         panic("Could not set SELinux security context: %s\n", strerror(errno));
     }
 
-    /* cd into the data directory */
+    // cd into the data directory, and set $HOME correspondingly.
     if (TEMP_FAILURE_RETRY(chdir(info.dataDir)) < 0) {
         panic("Could not cd to package's data directory: %s\n", strerror(errno));
     }
+    setenv("HOME", info.dataDir, 1);
+
+    // Reset parts of the environment, like su would.
+    setenv("PATH", _PATH_DEFPATH, 1);
+    unsetenv("IFS");
+
+    // Set the user-specific parts for this user.
+    struct passwd* pw = getpwuid(uid);
+    setenv("LOGNAME", pw->pw_name, 1);
+    setenv("SHELL", pw->pw_shell, 1);
+    setenv("USER", pw->pw_name, 1);
 
     /* User specified command for exec. */
     if ((argc >= commandArgvOfs + 1) &&