diff --git a/src/core/wscript b/src/core/wscript
index ae8b29f56..7ca9c388d 100644
--- a/src/core/wscript
+++ b/src/core/wscript
@@ -155,5 +155,5 @@ def build(bld):
                 ])
 
     if bld.env['ENABLE_GSL']:
-        core.uselib = 'GSL GSLCBLAS M'
+        core.uselib = core.uselib + ' GSL GSLCBLAS M'
         core.source.extend(['rng-test-suite.cc'])