diff --git a/ext/digest/displayIntermediateValues.c b/ext/digest/displayIntermediateValues.c
index f3bf9e2..02af490 100644
--- a/ext/digest/displayIntermediateValues.c
+++ b/ext/digest/displayIntermediateValues.c
@@ -110,7 +110,7 @@ void displayRoundNumber(int level, unsigned int i)
 void displayText(int level, const char *text)
 {
     if ((intermediateValueFile) && (level <= displayLevel)) {
-        fprintf(intermediateValueFile, text);
+        fprintf(intermediateValueFile, "%s", text);
         fprintf(intermediateValueFile, "\n");
         fprintf(intermediateValueFile, "\n");
     }