diff --git a/Alien/Package/Rpm.pm b/Alien/Package/Rpm.pm
index fd03504..9299901 100644
--- a/Alien/Package/Rpm.pm
+++ b/Alien/Package/Rpm.pm
@@ -448,6 +448,10 @@ are typically shell scripts, but often lack the leading #!/bin/sh
 This can confuse dpkg, so add the #!/bin/sh if it looks like there
 is no shebang magic already in place.
 
+Also, if the rpm is relocatable, the script could refer to
+RPM_INSTALL_PREFIX, which is set by rpm at run time. Deal with this by
+adding code to the script to set RPM_INSTALL_PREFIX.
+
 =cut
 
 # This helper function deals with all the scripts.
@@ -457,9 +461,18 @@ sub _script_helper {
 
 	# set
 	if (@_) {
+		my $prefixcode="";
+		if (defined $this->prefixes) {
+			$prefixcode="RPM_INSTALL_PREFIX=".$this->prefixes."\n";
+			$prefixcode.="export RPM_INSTALL_PREFIX\n";
+		}
+
 		my $value=shift;
 		if (length $value and $value !~ m/^#!\s*\//) {
-			$value="#!/bin/sh\n$value";
+			$value="#!/bin/sh\n$prefixcode$value";
+		}
+		else {
+			$value=~s/\n/\n$prefixcode/s;
 		}
 		$this->{$script} = $value;
 	}
diff --git a/debian/changelog b/debian/changelog
index 4bcf447..b52c6cb 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,8 +1,10 @@
 alien (8.65) UNRELEASED; urgency=low
 
   * Fix alien's own spec file, s/Copyright/License/.
+  * Add support for rpm scripts that use RPM_INSTALL_PREFIX, by setting
+    RPM_INSTALL_PREFIX as part of the converted script. Closes: #400863
 
- -- Joey Hess <joeyh@debian.org>  Thu, 14 Dec 2006 17:35:11 -0500
+ -- Joey Hess <joeyh@debian.org>  Fri, 15 Dec 2006 13:31:54 -0500
 
 alien (8.64) unstable; urgency=low