diff --git a/src/dds.imageio/ddsinput.cpp b/src/dds.imageio/ddsinput.cpp
index d6c120419d..7508f83a77 100644
--- a/src/dds.imageio/ddsinput.cpp
+++ b/src/dds.imageio/ddsinput.cpp
@@ -357,6 +357,7 @@ DDSInput::open(const std::string& name, ImageSpec& newspec)
 
     if (!ioproxy_use_or_open(name))
         return false;
+    ioseek(0);
 
     static_assert(sizeof(dds_header) == 128, "dds header size does not match");
     if (!ioread(&m_dds, sizeof(m_dds), 1))
diff --git a/src/psd.imageio/psdinput.cpp b/src/psd.imageio/psdinput.cpp
index 303b52e931..3bb24b04de 100644
--- a/src/psd.imageio/psdinput.cpp
+++ b/src/psd.imageio/psdinput.cpp
@@ -546,6 +546,7 @@ PSDInput::open(const std::string& name, ImageSpec& newspec)
     m_filename = name;
     if (!ioproxy_use_or_open(name))
         return false;
+    ioseek(0);
 
     // File Header
     if (!load_header()) {