diff --git a/code/AssetLib/Collada/ColladaExporter.cpp b/code/AssetLib/Collada/ColladaExporter.cpp
index 567f7c8e7..251cbee3e 100644
--- a/code/AssetLib/Collada/ColladaExporter.cpp
+++ b/code/AssetLib/Collada/ColladaExporter.cpp
@@ -573,7 +573,7 @@ bool ColladaExporter::ReadMaterialSurface(Surface &poSurface, const aiMaterial &
             index_str = index_str.substr(1, std::string::npos);
 
             try {
-                index = (unsigned int)strtoul10_64(index_str.c_str());
+                index = (unsigned int)strtoul10_64<DeadlyExportError>(index_str.c_str());
             } catch (std::exception &error) {
                 throw DeadlyExportError(error.what());
             }
diff --git a/include/assimp/fast_atof.h b/include/assimp/fast_atof.h
index 6e9a1bba7..79740a1e8 100644
--- a/include/assimp/fast_atof.h
+++ b/include/assimp/fast_atof.h
@@ -29,6 +29,7 @@
 
 #include "StringComparison.h"
 #include <assimp/DefaultLogger.hpp>
+#include <assimp/Exceptional.h>
 
 #ifdef _MSC_VER
 #  include <stdint.h>
@@ -185,13 +186,14 @@ unsigned int strtoul_cppstyle( const char* in, const char** out=0) {
 // Special version of the function, providing higher accuracy and safety
 // It is mainly used by fast_atof to prevent ugly and unwanted integer overflows.
 // ------------------------------------------------------------------------------------
+template<typename ExceptionType = DeadlyImportError>
 inline
 uint64_t strtoul10_64( const char* in, const char** out=0, unsigned int* max_inout=0) {
     unsigned int cur = 0;
     uint64_t value = 0;
 
     if ( *in < '0' || *in > '9' ) {
-        throw std::invalid_argument( std::string( "The string \"" ) + in + "\" cannot be converted into a value." );
+        throw DeadlyImportError("The string \"", in, "\" cannot be converted into a value." );
     }
 
     for ( ;; ) {
@@ -237,6 +239,7 @@ uint64_t strtoul10_64( const char* in, const char** out=0, unsigned int* max_ino
 // ------------------------------------------------------------------------------------
 // signed variant of strtoul10_64
 // ------------------------------------------------------------------------------------
+template<typename ExceptionType = DeadlyImportError>
 inline
 int64_t strtol10_64(const char* in, const char** out = 0, unsigned int* max_inout = 0) {
     bool inv = (*in == '-');
@@ -244,7 +247,7 @@ int64_t strtol10_64(const char* in, const char** out = 0, unsigned int* max_inou
         ++in;
     }
 
-    int64_t value = strtoul10_64(in, out, max_inout);
+    int64_t value = strtoul10_64<ExceptionType>(in, out, max_inout);
     if (inv) {
         value = -value;
     }
@@ -259,7 +262,7 @@ int64_t strtol10_64(const char* in, const char** out = 0, unsigned int* max_inou
 //! about 6 times faster than atof in win32.
 // If you find any bugs, please send them to me, niko (at) irrlicht3d.org.
 // ------------------------------------------------------------------------------------
-template<typename Real>
+template<typename Real, typename ExceptionType = DeadlyImportError>
 inline
 const char* fast_atoreal_move(const char* c, Real& out, bool check_comma = true) {
     Real f = 0;
@@ -289,13 +292,13 @@ 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')) {
-        throw std::invalid_argument("Cannot parse string "
-                                    "as real number: does not start with digit "
+        throw ExceptionType("Cannot parse string \"", c, 
+                                    "\" as a real number: does not start with digit "
                                     "or decimal point followed by digit.");
     }
 
     if (*c != '.' && (! check_comma || c[0] != ',')) {
-        f = static_cast<Real>( strtoul10_64 ( c, &c) );
+        f = static_cast<Real>( strtoul10_64<ExceptionType> ( c, &c) );
     }
 
     if ((*c == '.' || (check_comma && c[0] == ',')) && c[1] >= '0' && c[1] <= '9') {
@@ -310,7 +313,7 @@ const char* fast_atoreal_move(const char* c, Real& out, bool check_comma = true)
         // number of digits to be read. AI_FAST_ATOF_RELAVANT_DECIMALS can be a value between
         // 1 and 15.
         unsigned int diff = AI_FAST_ATOF_RELAVANT_DECIMALS;
-        double pl = static_cast<double>( strtoul10_64 ( c, &c, &diff ));
+        double pl = static_cast<double>( strtoul10_64<ExceptionType> ( c, &c, &diff ));
 
         pl *= fast_atof_table[diff];
         f += static_cast<Real>( pl );
@@ -332,7 +335,7 @@ const char* fast_atoreal_move(const char* c, Real& out, bool check_comma = true)
         // The reason float constants are used here is that we've seen cases where compilers
         // would perform such casts on compile-time constants at runtime, which would be
         // bad considering how frequently fast_atoreal_move<float> is called in Assimp.
-        Real exp = static_cast<Real>( strtoul10_64(c, &c) );
+        Real exp = static_cast<Real>( strtoul10_64<ExceptionType>(c, &c) );
         if (einv) {
             exp = -exp;
         }
@@ -348,26 +351,29 @@ const char* fast_atoreal_move(const char* c, Real& out, bool check_comma = true)
 
 // ------------------------------------------------------------------------------------
 // The same but more human.
+template<typename ExceptionType = DeadlyImportError>
 inline
 ai_real fast_atof(const char* c) {
     ai_real ret(0.0);
-    fast_atoreal_move<ai_real>(c, ret);
+    fast_atoreal_move<ai_real, ExceptionType>(c, ret);
 
     return ret;
 }
 
+template<typename ExceptionType = DeadlyImportError>
 inline
 ai_real fast_atof( const char* c, const char** cout) {
     ai_real ret(0.0);
-    *cout = fast_atoreal_move<ai_real>(c, ret);
+    *cout = fast_atoreal_move<ai_real, ExceptionType>(c, ret);
 
     return ret;
 }
 
+template<typename ExceptionType = DeadlyImportError>
 inline
 ai_real fast_atof( const char** inout) {
     ai_real ret(0.0);
-    *inout = fast_atoreal_move<ai_real>(*inout, ret);
+    *inout = fast_atoreal_move<ai_real, ExceptionType>(*inout, ret);
 
     return ret;
 }