diff --git a/code/AssetLib/Collada/ColladaParser.cpp b/code/AssetLib/Collada/ColladaParser.cpp
index 37c7274f4..7aa37a112 100644
--- a/code/AssetLib/Collada/ColladaParser.cpp
+++ b/code/AssetLib/Collada/ColladaParser.cpp
@@ -231,11 +231,7 @@ void ColladaParser::UriDecodePath(aiString &ss) {
 
     // Maxon Cinema Collada Export writes "file:///C:\andsoon" with three slashes...
     // I need to filter it without destroying linux paths starting with "/somewhere"
-#if defined(_MSC_VER)
     if (ss.data[0] == '/' && isalpha((unsigned char)ss.data[1]) && ss.data[2] == ':') {
-#else
-    if (ss.data[0] == '/' && isalpha((unsigned char)ss.data[1]) && ss.data[2] == ':') {
-#endif
         --ss.length;
         ::memmove(ss.data, ss.data + 1, ss.length);
         ss.data[ss.length] = 0;
diff --git a/code/AssetLib/X/XFileImporter.cpp b/code/AssetLib/X/XFileImporter.cpp
index df1aba331..4c8c54551 100644
--- a/code/AssetLib/X/XFileImporter.cpp
+++ b/code/AssetLib/X/XFileImporter.cpp
@@ -667,9 +667,7 @@ void XFileImporter::ConvertMaterials( aiScene* pScene, std::vector<XFile::Materi
 
                 // convert to lower case for easier comparison
                 for ( unsigned int c = 0; c < sz.length(); ++c ) {
-                    if ( isalpha( (unsigned char) sz[ c ] ) ) {
-                        sz[ c ] = (char) tolower( (unsigned char) sz[ c ] );
-                    }
+                    sz[ c ] = (char) tolower( (unsigned char) sz[ c ] );
                 }
 
                 // Place texture filename property under the corresponding name
diff --git a/code/AssetLib/glTF2/glTF2Importer.cpp b/code/AssetLib/glTF2/glTF2Importer.cpp
index d80df97d2..921aaad9e 100644
--- a/code/AssetLib/glTF2/glTF2Importer.cpp
+++ b/code/AssetLib/glTF2/glTF2Importer.cpp
@@ -992,8 +992,8 @@ void ParseExtensions(aiMetadata *metadata, const CustomExtension &extension) {
         metadata->Add(extension.name.c_str(), extension.mBoolValue.value);
     } else if (extension.mValues.isPresent) {
         aiMetadata val;
-        for (size_t i = 0; i < extension.mValues.value.size(); ++i) {
-            ParseExtensions(&val, extension.mValues.value[i]);
+        for (auto const & subExtension : extension.mValues.value) {
+            ParseExtensions(&val, subExtension);
         }
         metadata->Add(extension.name.c_str(), val);
     }
@@ -1001,8 +1001,8 @@ void ParseExtensions(aiMetadata *metadata, const CustomExtension &extension) {
 
 void ParseExtras(aiMetadata *metadata, const CustomExtension &extension) {
     if (extension.mValues.isPresent) {
-        for (size_t i = 0; i < extension.mValues.value.size(); ++i) {
-            ParseExtensions(metadata, extension.mValues.value[i]);
+        for (auto const & subExtension : extension.mValues.value) {
+            ParseExtensions(metadata, subExtension);
         }
     }
 }
diff --git a/include/assimp/fast_atof.h b/include/assimp/fast_atof.h
index aea793f35..43bbbff64 100644
--- a/include/assimp/fast_atof.h
+++ b/include/assimp/fast_atof.h
@@ -194,7 +194,7 @@ uint64_t strtoul10_64( const char* in, const char** out=0, unsigned int* max_ino
 
     if ( *in < '0' || *in > '9' ) {
         // The string is known to be bad, so don't risk printing the whole thing.
-        throw ExceptionType("The string \"", ai_str_toprintable(in, 30), "\" cannot be converted into a value." );
+        throw ExceptionType("The string \"", ai_str_toprintable(in, (int)strlen(in)), "\" cannot be converted into a value." );
     }
 
     for ( ;; ) {
@@ -294,7 +294,7 @@ const char* fast_atoreal_move(const char* c, Real& out, bool check_comma = true)
     if (!(c[0] >= '0' && c[0] <= '9') &&
             !((c[0] == '.' || (check_comma && c[0] == ',')) && c[1] >= '0' && c[1] <= '9')) {
         // The string is known to be bad, so don't risk printing the whole thing.
-        throw ExceptionType("Cannot parse string \"", ai_str_toprintable(c, 30),
+        throw ExceptionType("Cannot parse string \"", ai_str_toprintable(c, (int)strlen(c)),
                                     "\" as a real number: does not start with digit "
                                     "or decimal point followed by digit.");
     }