diff --git a/libtpms.spec b/libtpms.spec
index a2da95b..4fbb91d 100644
--- a/libtpms.spec
+++ b/libtpms.spec
@@ -26,6 +26,7 @@ Url:            http://sourceforge.net/projects/ibmswtpm
 #Source:        http://bergerstefan.users.sourceforge.net/libtpms/%{name}-%{version}.tar.gz
 Source0:        %{name}-%{version}.tar.gz
 BuildRequires:  openssl-devel
+BuildRequires:  mozilla-nspr-devel
 
 %description
 A library providing TPM functionality for VMs. Targeted for integration