diff --git a/CHANGES b/CHANGES
index 164210b5a3..7f94f85c75 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+4877.	[bug]		Address integer overflow when exponentially
+			backing off retry intervals. [RT #47041]
+
 4876.	[bug]		Address deadlock with accessing a keytable. [RT #47000]
 
 4875.	[bug]		Address compile failures on older systems. [RT #47015]
diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
index 40f10461ac..32bd83f6cf 100644
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -1810,8 +1810,12 @@ fctx_setretryinterval(fetchctx_t *fctx, unsigned int rtt) {
 	/*
 	 * Exponential backoff after the first few tries.
 	 */
-	if (fctx->restarts > fctx->res->nonbackofftries)
-		us <<= (fctx->restarts - fctx->res->nonbackofftries);
+	if (fctx->restarts > fctx->res->nonbackofftries) {
+		int shift = fctx->restarts - fctx->res->nonbackofftries;
+		if (shift > 6)
+			shift = 6;
+		us <<= shift;
+	}
 
 	/*
 	 * Add a fudge factor to the expected rtt based on the current