diff --git a/src/rla.imageio/rlainput.cpp b/src/rla.imageio/rlainput.cpp
index 194e5b272b..eb553c6042 100644
--- a/src/rla.imageio/rlainput.cpp
+++ b/src/rla.imageio/rlainput.cpp
@@ -328,7 +328,7 @@ RLAInput::seek_subimage(int subimage, int miplevel)
             m_spec.z_channel = z_channel;
             if (m_spec.channelnames.size() < size_t(z_channel + 1))
                 m_spec.channelnames.resize(z_channel + 1);
-            m_spec.channelnames[z_channel] = "Z";
+            m_spec.channelnames[z_channel] = std::string("Z");
         }
     }
     m_stride += m_rla.NumOfAuxChannels * aux_type.size();