diff --git a/cddlib.spec b/cddlib.spec
index bfaef2d..12f23d5 100644
--- a/cddlib.spec
+++ b/cddlib.spec
@@ -49,7 +49,7 @@ of linear inequalities.
 %package devel
 Summary:        Development files for cddlib
 Group:          Development/Libraries/C and C++
-Requires:       %lname = %version
+Requires:       %lname = %version, gmp-devel
 
 %description devel
 cddlib is a C implementation of the Double Description Method of