diff --git a/src/backend/utils/adt/numeric.c b/src/backend/utils/adt/numeric.c
index c4bc665d6a4..4ca13f4f477 100644
--- a/src/backend/utils/adt/numeric.c
+++ b/src/backend/utils/adt/numeric.c
@@ -10227,9 +10227,13 @@ power_var(const NumericVar *base, const NumericVar *exp, NumericVar *result)
 	 */
 	ln_dweight = estimate_ln_dweight(base);
 
+	/*
+	 * Set the scale for the low-precision calculation, computing ln(base) to
+	 * around 8 significant digits.  Note that ln_dweight may be as small as
+	 * -SHRT_MAX, so the scale may exceed NUMERIC_MAX_DISPLAY_SCALE here.
+	 */
 	local_rscale = 8 - ln_dweight;
 	local_rscale = Max(local_rscale, NUMERIC_MIN_DISPLAY_SCALE);
-	local_rscale = Min(local_rscale, NUMERIC_MAX_DISPLAY_SCALE);
 
 	ln_var(base, &ln_base, local_rscale);
 
diff --git a/src/test/regress/expected/numeric.out b/src/test/regress/expected/numeric.out
index 7590aabb49a..bea33181bee 100644
--- a/src/test/regress/expected/numeric.out
+++ b/src/test/regress/expected/numeric.out
@@ -2420,6 +2420,12 @@ select coalesce(nullif(0.9999999999 ^ 23300000000000, 0), 0) as rounds_to_zero;
               0
 (1 row)
 
+select round(((1 - 1.500012345678e-1000) ^ 1.45e1003) * 1e1000);
+                          round                           
+----------------------------------------------------------
+ 25218976308958387188077465658068501556514992509509282366
+(1 row)
+
 -- cases that used to error out
 select 0.12 ^ (-25);
                  ?column?                  
diff --git a/src/test/regress/sql/numeric.sql b/src/test/regress/sql/numeric.sql
index 0f2382e169f..9233c666d4b 100644
--- a/src/test/regress/sql/numeric.sql
+++ b/src/test/regress/sql/numeric.sql
@@ -1114,6 +1114,7 @@ select 1.2 ^ 345;
 select 0.12 ^ (-20);
 select 1.000000000123 ^ (-2147483648);
 select coalesce(nullif(0.9999999999 ^ 23300000000000, 0), 0) as rounds_to_zero;
+select round(((1 - 1.500012345678e-1000) ^ 1.45e1003) * 1e1000);
 
 -- cases that used to error out
 select 0.12 ^ (-25);