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--- a/src/utils/base64.cpp
+++ b/src/utils/base64.cpp
@@ -217,7 +217,7 @@
 
     out.clear();
 
-    int srclength = in.length();
+    string::size_type srclength = in.length();
     int sidx = 0;
     while (2 < srclength) {
 	input[0] = in[sidx++];
@@ -244,7 +244,7 @@
     if (0 != srclength) {
 	/* Get what's left. */
 	input[0] = input[1] = input[2] = '\0';
-	for (int i = 0; i < srclength; i++)
+	for (string::size_type i = 0; i < srclength; i++)
 	    input[i] = in[sidx++];
 	
 	output[0] = input[0] >> 2;