diff --git a/src/test/regress/expected/float4-exp-three-digits.out b/src/test/regress/expected/float4-exp-three-digits.out
index f17f95697a..ea6f77a671 100644
--- a/src/test/regress/expected/float4-exp-three-digits.out
+++ b/src/test/regress/expected/float4-exp-three-digits.out
@@ -125,6 +125,18 @@ SELECT 'nan'::numeric::float4;
     NaN
 (1 row)
 
+SELECT 'nan'::float8::float4;
+ float4 
+--------
+    NaN
+(1 row)
+
+SELECT 'nan'::float4::float8;
+ float8 
+--------
+    NaN
+(1 row)
+
 SELECT '' AS five, * FROM FLOAT4_TBL;
  five |      f1      
 ------+--------------
diff --git a/src/test/regress/expected/float4.out b/src/test/regress/expected/float4.out
index fd46a4a1db..ab9b1acd49 100644
--- a/src/test/regress/expected/float4.out
+++ b/src/test/regress/expected/float4.out
@@ -125,6 +125,18 @@ SELECT 'nan'::numeric::float4;
     NaN
 (1 row)
 
+SELECT 'nan'::float8::float4;
+ float4 
+--------
+    NaN
+(1 row)
+
+SELECT 'nan'::float4::float8;
+ float8 
+--------
+    NaN
+(1 row)
+
 SELECT '' AS five, * FROM FLOAT4_TBL;
  five |     f1      
 ------+-------------
diff --git a/src/test/regress/sql/float4.sql b/src/test/regress/sql/float4.sql
index 3b363f9463..e6f5c7425d 100644
--- a/src/test/regress/sql/float4.sql
+++ b/src/test/regress/sql/float4.sql
@@ -41,6 +41,8 @@ SELECT 'Infinity'::float4 + 100.0;
 SELECT 'Infinity'::float4 / 'Infinity'::float4;
 SELECT 'nan'::float4 / 'nan'::float4;
 SELECT 'nan'::numeric::float4;
+SELECT 'nan'::float8::float4;
+SELECT 'nan'::float4::float8;
 
 SELECT '' AS five, * FROM FLOAT4_TBL;