diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 4a6850a2f..3505d7155 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -12,6 +12,7 @@ jasperarmstrong
 keyboard
 Lapayo
 Luksor
+linnemannr (Reid Linnemann)
 M10360
 marmot21
 Masy98
diff --git a/src/Generating/FinishGen.cpp b/src/Generating/FinishGen.cpp
index 5540f80d4..656dc95db 100644
--- a/src/Generating/FinishGen.cpp
+++ b/src/Generating/FinishGen.cpp
@@ -1375,8 +1375,12 @@ eMonsterType cFinishGenPassiveMobs::GetRandomMob(cChunkDesc & a_ChunkDesc)
 		return mtInvalidType;
 	}
 
-	size_t RandMob = static_cast<size_t>((m_Noise.IntNoise2DInt(chunkX - chunkZ + 2, chunkX + 5) / 7)) % ListOfSpawnables.size();
 	auto MobIter = ListOfSpawnables.begin();
+	using diff_type =
+		std::iterator_traits<decltype(MobIter)>::difference_type;
+	diff_type RandMob = static_cast<diff_type>
+		((unsigned long)(m_Noise.IntNoise2DInt(chunkX - chunkZ + 2, chunkX + 5) / 7)
+		% ListOfSpawnables.size());
 	std::advance(MobIter, RandMob);
 
 	return *MobIter;
diff --git a/src/OSSupport/StackTrace.cpp b/src/OSSupport/StackTrace.cpp
index 015a53ba0..1ec10f20e 100644
--- a/src/OSSupport/StackTrace.cpp
+++ b/src/OSSupport/StackTrace.cpp
@@ -12,6 +12,13 @@
 	#include <unistd.h>
 #endif
 
+// FreeBSD uses size_t for the return type of backtrace()
+#if defined(__FreeBSD__) && (__FreeBSD__ >= 10)
+	#define btsize size_t
+#else
+	#define btsize int
+#endif
+
 
 
 
@@ -34,7 +41,7 @@ void PrintStackTrace(void)
 		// Use the backtrace() function to get and output the stackTrace:
 		// Code adapted from http://stackoverflow.com/questions/77005/how-to-generate-a-stacktrace-when-my-gcc-c-app-crashes
 		void * stackTrace[30];
-		int numItems = backtrace(stackTrace, ARRAYCOUNT(stackTrace));
+		btsize numItems = backtrace(stackTrace, ARRAYCOUNT(stackTrace));
 		backtrace_symbols_fd(stackTrace, numItems, STDERR_FILENO);
 	#endif
 }
diff --git a/src/StringUtils.h b/src/StringUtils.h
index 8f67d8031..62767d007 100644
--- a/src/StringUtils.h
+++ b/src/StringUtils.h
@@ -168,6 +168,12 @@ bool StringToInteger(const AString & a_str, T & a_Num)
 	}
 	else
 	{
+		// Unsigned result cannot be signed!
+		if (!std::numeric_limits<T>::is_signed)
+		{
+			return false;
+		}
+
 		for (size_t size = a_str.size(); i < size; i++)
 		{
 			if ((a_str[i] < '0') || (a_str[i] > '9'))