diff --git a/src/cr2image.cpp b/src/cr2image.cpp
index dfcf580c5e..c36c440e30 100644
--- a/src/cr2image.cpp
+++ b/src/cr2image.cpp
@@ -175,7 +175,7 @@ namespace Exiv2 {
         };
         for (auto&& filteredIfd : filteredIfds) {
 #ifdef EXIV2_DEBUG_MESSAGES
-            std::cerr << "Warning: Exif IFD " << filteredIfds[i] << " not encoded\n";
+            std::cerr << "Warning: Exif IFD " << filteredIfd << " not encoded\n";
 #endif
             ed.erase(std::remove_if(ed.begin(), ed.end(), FindExifdatum(filteredIfd)), ed.end());
         }
diff --git a/src/exif.cpp b/src/exif.cpp
index 04799bb95b..b6b341789a 100644
--- a/src/exif.cpp
+++ b/src/exif.cpp
@@ -711,7 +711,7 @@ namespace Exiv2 {
         };
         for (auto&& filteredIfd : filteredIfds) {
 #ifdef EXIV2_DEBUG_MESSAGES
-            std::cerr << "Warning: Exif IFD " << filteredIfds[i] << " not encoded\n";
+            std::cerr << "Warning: Exif IFD " << filteredIfds << " not encoded\n";
 #endif
             eraseIfd(ed, filteredIfd);
         }
diff --git a/src/orfimage.cpp b/src/orfimage.cpp
index e71b6da5fc..77aae0a0cb 100644
--- a/src/orfimage.cpp
+++ b/src/orfimage.cpp
@@ -181,7 +181,7 @@ namespace Exiv2 {
         };
         for (auto&& filteredIfd : filteredIfds) {
 #ifdef EXIV2_DEBUG_MESSAGES
-            std::cerr << "Warning: Exif IFD " << filteredIfds[i] << " not encoded\n";
+            std::cerr << "Warning: Exif IFD " << filteredIfds << " not encoded\n";
 #endif
             ed.erase(std::remove_if(ed.begin(), ed.end(), FindExifdatum(filteredIfd)), ed.end());
         }
diff --git a/src/rw2image.cpp b/src/rw2image.cpp
index 177ea55ee7..d74d335646 100644
--- a/src/rw2image.cpp
+++ b/src/rw2image.cpp
@@ -156,8 +156,8 @@ namespace Exiv2 {
                 auto dup = prevData.findKey(ExifKey(pos.key()));
                 if (dup != prevData.end()) {
 #ifdef EXIV2_DEBUG_MESSAGES
-                    std::cerr << "Filtering duplicate tag " << pos->key()
-                              << " (values '" << pos->value()
+                    std::cerr << "Filtering duplicate tag " << pos.key()
+                              << " (values '" << pos.value()
                               << "' and '" << dup->value() << "')\n";
 #endif
                     prevData.erase(dup);
diff --git a/src/tiffimage.cpp b/src/tiffimage.cpp
index 84b7716ecf..4c2537741a 100644
--- a/src/tiffimage.cpp
+++ b/src/tiffimage.cpp
@@ -291,7 +291,7 @@ namespace Exiv2 {
         };
         for (auto&& filteredIfd : filteredIfds) {
 #ifdef EXIV2_DEBUG_MESSAGES
-            std::cerr << "Warning: Exif IFD " << filteredIfds[i] << " not encoded\n";
+            std::cerr << "Warning: Exif IFD " << filteredIfd << " not encoded\n";
 #endif
             ed.erase(std::remove_if(ed.begin(), ed.end(), FindExifdatum(filteredIfd)), ed.end());
         }
diff --git a/src/xmp.cpp b/src/xmp.cpp
index 4b769a837b..b0be4d7b1b 100644
--- a/src/xmp.cpp
+++ b/src/xmp.cpp
@@ -746,7 +746,7 @@ namespace Exiv2 {
         // Register custom namespaces with XMP-SDK
         for (auto&& i : XmpProperties::nsRegistry_) {
 #ifdef EXIV2_DEBUG_MESSAGES
-            std::cerr << "Registering " << i->second.prefix_ << " : " << i->first << "\n";
+            std::cerr << "Registering " << i.second.prefix_ << " : " << i.first << "\n";
 #endif
             registerNs(i.first, i.second.prefix_);
         }