diff --git a/validat0.cpp b/validat0.cpp
index a612c8b2..64144e7d 100644
--- a/validat0.cpp
+++ b/validat0.cpp
@@ -336,20 +336,26 @@ bool TestConversion()
 	{
 		signed int v; bool p = true;
 		{
-			signed long v1 = std::numeric_limits<signed long>::min(); p = !SafeConvert(v1, v) && p;
-			signed long v2 = std::numeric_limits<signed long>::max(); p = !SafeConvert(v2, v) && p;
-			unsigned long v3 = std::numeric_limits<unsigned long>::max(); p = !SafeConvert(v3, v) && p;
+			// Guard i686 collision of type sizes
+			if(sizeof(signed int) != sizeof(signed long))
+			{
+				signed long v1 = std::numeric_limits<signed long>::min(); p = !SafeConvert(v1, v) && p;
+				signed long v2 = std::numeric_limits<signed long>::max(); p = !SafeConvert(v2, v) && p;
+				unsigned long v3 = std::numeric_limits<unsigned long>::max(); p = !SafeConvert(v3, v) && p;
+			}
+			// Guard i686 collision of type sizes
+			if(sizeof(signed int) != sizeof(signed long long))
+			{
+				signed long long v1 = std::numeric_limits<signed long long>::min(); p = !SafeConvert(v1, v) && p;
+				signed long long v2 = std::numeric_limits<signed long long>::max(); p = !SafeConvert(v2, v) && p;
+				unsigned long long v3 = std::numeric_limits<unsigned long long>::max(); p = !SafeConvert(v3, v) && p;
+			}
+
+			std::cout << (!p ? "FAILED   " : "passed   ") << " signed int overflow" << std::endl;
+			pass &= p;
 		}
-		{
-			signed long long v1 = std::numeric_limits<signed long long>::min(); p = !SafeConvert(v1, v) && p;
-			signed long long v2 = std::numeric_limits<signed long long>::max(); p = !SafeConvert(v2, v) && p;
-			unsigned long long v3 = std::numeric_limits<unsigned long long>::max(); p = !SafeConvert(v3, v) && p;
-		}
-		
-		std::cout << (!p ? "FAILED   " : "passed   ") << " signed int overflow" << std::endl;
-		pass &= p;
 	}
-	
+
 	/********** unsigned int **********/
 	{
 		unsigned int v1, v2; bool p = true;
@@ -366,14 +372,20 @@ bool TestConversion()
 	{
 		unsigned int v; bool p = true;
 		{
-			unsigned long v1 = std::numeric_limits<unsigned long>::max(); p = !SafeConvert(v1, v) && p;
+			// Guard i686 collision of type sizes
+			if(sizeof(unsigned int) != sizeof(unsigned long))
+			{
+				unsigned long v1 = std::numeric_limits<unsigned long>::max(); p = !SafeConvert(v1, v) && p;
+			}
+			// Guard i686 collision of type sizes
+			if(sizeof(unsigned int) != sizeof(unsigned long long))
+			{
+				unsigned long long v1 = std::numeric_limits<unsigned long long>::max(); p = !SafeConvert(v1, v) && p;
+			}
+
+			std::cout << (!p ? "FAILED   " : "passed   ") << " unsigned int overflow" << std::endl;
+			pass &= p;
 		}
-		{
-			unsigned long long v1 = std::numeric_limits<unsigned long long>::max(); p = !SafeConvert(v1, v) && p;
-		}
-		
-		std::cout << (!p ? "FAILED   " : "passed   ") << " unsigned int overflow" << std::endl;
-		pass &= p;
 	}
 
 	/********** signed long **********/
@@ -393,6 +405,7 @@ bool TestConversion()
 
 	/********** signed long overflow **********/
 	{
+		// Guard x86_64 collision of type sizes
 		if(sizeof(signed long) != sizeof(signed long long))
 		{
 			signed long v; bool p = true;
@@ -425,6 +438,7 @@ bool TestConversion()
 
 	/********** unsigned long overflow **********/
 	{
+		// Guard x86_64 collision of type sizes
 		if(sizeof(unsigned long) != sizeof(unsigned long long))
 		{
 			unsigned long v; bool p = true;