diff --git a/core/logic/smn_string.cpp b/core/logic/smn_string.cpp
index 76ff2e05..40de4252 100644
--- a/core/logic/smn_string.cpp
+++ b/core/logic/smn_string.cpp
@@ -139,6 +139,22 @@ static cell_t StringToIntEx(IPluginContext *pCtx, const cell_t *params)
 	return dummy - str;
 }
 
+static cell_t StringToInt64(IPluginContext *pCtx, const cell_t *params)
+{
+	char *str, *dummy = NULL;
+	cell_t *addr;
+	pCtx->LocalToString(params[1], &str);
+	pCtx->LocalToPhysAddr(params[2], &addr);
+
+	// uint64_t for correct signed right shift.
+	uint64_t number = (uint64_t)strtoll(str, &dummy, params[3]);
+
+	addr[0] = (cell_t)(number & 0xFFFFFFFFull);
+	addr[1] = (cell_t)(number >> 32ull);
+
+	return dummy - str;
+}
+
 static cell_t sm_numtostr(IPluginContext *pCtx, const cell_t *params)
 {
 	char *str;
@@ -148,6 +164,17 @@ static cell_t sm_numtostr(IPluginContext *pCtx, const cell_t *params)
 	return static_cast<cell_t>(res);
 }
 
+static cell_t Int64ToString(IPluginContext *pCtx, const cell_t *params)
+{
+	cell_t *num;
+	char *str;
+	pCtx->LocalToPhysAddr(params[1], &num);
+	pCtx->LocalToString(params[2], &str);
+	size_t res = ke::SafeSprintf(str, params[3], "%" KE_FMT_I64, (int64_t)num[1] << 32ll | (int64_t)num[0]);
+
+	return static_cast<cell_t>(res);
+}
+
 static cell_t sm_strtofloat(IPluginContext *pCtx, const cell_t *params)
 {
 	char *str, *dummy;
@@ -591,6 +618,7 @@ REGISTER_NATIVES(basicStrings)
 	{"FormatEx",			sm_formatex},
 	{"GetCharBytes",		GetCharBytes},
 	{"IntToString",			sm_numtostr},
+	{"Int64ToString",		Int64ToString},
 	{"IsCharAlpha",			IsCharAlpha},
 	{"IsCharLower",			IsCharLower},
 	{"IsCharMB",			IsCharMB},
@@ -607,6 +635,7 @@ REGISTER_NATIVES(basicStrings)
 	{"strcopy",				sm_strcopy},
 	{"StringToInt",			sm_strconvint},
 	{"StringToIntEx",		StringToIntEx},
+	{"StringToInt64",		StringToInt64},
 	{"StringToFloat",		sm_strtofloat},
 	{"StringToFloatEx",		StringToFloatEx},
 	{"StripQuotes",			StripQuotes},
diff --git a/plugins/include/string.inc b/plugins/include/string.inc
index 6f3f0dd3..c64d30db 100644
--- a/plugins/include/string.inc
+++ b/plugins/include/string.inc
@@ -195,6 +195,17 @@ native int StringToInt(const char[] str, int nBase=10);
  */
 native int StringToIntEx(const char[] str, int &result, int nBase=10);
 
+/**
+ * Converts a string to a 64-bit integer.
+ *
+ * @param str           String to convert.
+ * @param result        Array to store the upper and lower
+ *                      32-bits of the 64-bit integer.
+ * @param nBase         Numerical base to use.  10 is default.
+ * @return              Number of characters consumed.
+ */
+native int StringToInt64(const char[] str, int result[2], int nBase=10);
+
 /**
  * Converts an integer to a string.
  *
@@ -205,6 +216,18 @@ native int StringToIntEx(const char[] str, int &result, int nBase=10);
  */
 native int IntToString(int num, char[] str, int maxlength);
 
+/**
+ * Converts a 64-bit integer to a string.
+ *
+ * @param num           Array containing the upper and lower
+ *                      32-bits of a 64-bit integer.
+ * @param str           Buffer to store string in.
+ * @param maxlength     Maximum length of string buffer.
+ * @return              Number of characters written to the buffer,
+ *                      not including the null terminator.
+ */
+native int Int64ToString(const int num[2], char[] str, int maxlength);
+
 /** 
  * Converts a string to a floating point number.
  *