diff --git a/devtools/extract_mort/extract_mort.cpp b/devtools/extract_mort/extract_mort.cpp
index 7e4003a8c6c..b4df533150b 100644
--- a/devtools/extract_mort/extract_mort.cpp
+++ b/devtools/extract_mort/extract_mort.cpp
@@ -361,7 +361,7 @@ static void import_strings(const char *textFilename) {
 
 	// Set up a buffer for the output compressed strings
 	uint16 strData[BUFFER_SIZE];
-	memset(strData, 0, BUFFER_SIZE);
+	memset(strData, 0, BUFFER_SIZE*sizeof(uint16));
 	char sLine[BUFFER_SIZE];
 
 	int indis = 0;