diff --git a/prism/src/prism/Prism.java b/prism/src/prism/Prism.java
index a3934136..e5f3eb3b 100644
--- a/prism/src/prism/Prism.java
+++ b/prism/src/prism/Prism.java
@@ -55,7 +55,7 @@ public class Prism implements PrismSettingsListener
 	/** Optional PRISM version suffix (e.g. "dev", "beta"). Read from prism.Version. */
 	private static String versionSuffix = prism.Version.versionSuffixString;
 	
-	/** Build number (e.g. "r6667"). Defaults to "" (undefined), read from prism.Revision class if present. */
+	/** Build number (e.g. "6667"). Defaults to "" (undefined), read from prism.Revision class if present. */
 	private static String buildNumber = "";
 	static {
 	    try {
@@ -569,7 +569,7 @@ public class Prism implements PrismSettingsListener
 			v += "." + versionSuffix;
 			// In this case, also append any build number
 			if (buildNumber.length() > 0)
-				v += "." + buildNumber;
+				v += ".r" + buildNumber;
 		}
 		return v;
 	}
diff --git a/prism/src/scripts/printversion.sh b/prism/src/scripts/printversion.sh
index ace99214..3a53d30d 100755
--- a/prism/src/scripts/printversion.sh
+++ b/prism/src/scripts/printversion.sh
@@ -23,7 +23,7 @@ if [ -f "$SRC_DIR"/prism/Version.java ]; then
 			if [ -f "$SRC_DIR"/prism/Revision.java ]; then
 				REVISION_SVN=`grep svnRevision "$SRC_DIR"/prism/Revision.java | sed -E 's/[^"]+"([^"]*)"[^"]+/\1/'`
 				if [ "$REVISION_SVN" != "" ]; then
-					/bin/echo -n ".$REVISION_SVN"
+					/bin/echo -n ".r$REVISION_SVN"
 				fi
 			fi
 		fi