diff --git a/projects/openexr.com/imath/package.yml b/projects/openexr.com/imath/package.yml
index 0156d7cf..1b7e6f30 100644
--- a/projects/openexr.com/imath/package.yml
+++ b/projects/openexr.com/imath/package.yml
@@ -25,6 +25,8 @@ build:
       - -DCMAKE_BUILD_TYPE=Release
 
 test:
+  dependencies:
+    gnu.org/gcc: '*'  # libstdc++
   fixture: |
     #include <ImathRoots.h>
     #include <algorithm>