diff --git a/modules/geom/src/vec3.cc b/modules/geom/src/vec3.cc
index 76f3e7e43231cd17749275af070ce8d50cadf0d8..8909ce8b8648879741c01965ef13961614223e6b 100644
--- a/modules/geom/src/vec3.cc
+++ b/modules/geom/src/vec3.cc
@@ -29,7 +29,7 @@
 namespace geom {
 
 
-#ifdef OST_DOUBLE_PRECISION
+#if OST_DOUBLE_PRECISION
 typedef Eigen::Matrix3d EMat3;
 #else
 typedef Eigen::Matrix3f EMat3;