diff --git a/src/Sema.zig b/src/Sema.zig
index c7d40ffa095a3416a65806bba49d84f6bbbc8da7..35f35d8e581d87e16335725a025a636e32ddffdf 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -25542,10 +25542,10 @@ fn zirRoundOpType(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.InstDa
         return .generic_poison_type;
     };
 
-    const float_ty = dest_ty.optEuBaseType(zcu);
-    switch (float_ty.scalarType(zcu).zigTypeTag(zcu)) {
-        .float, .comptime_float => return .fromType(float_ty),
-        else => return .comptime_float_type,
+    const dest_base_ty = dest_ty.optEuBaseType(zcu);
+    switch (dest_base_ty.scalarType(zcu).zigTypeTag(zcu)) {
+        .float, .comptime_float => return .fromType(dest_base_ty),
+        else => return .generic_poison_type,
     }
 }
 
diff --git a/test/behavior/cast.zig b/test/behavior/cast.zig
index 077d3faeddc080357b48304a3f46240ad83e1fdd..2a79566b74f6fad214b6324ff3e41b5ae087ae6d 100644
--- a/test/behavior/cast.zig
+++ b/test/behavior/cast.zig
@@ -120,6 +120,7 @@ test "@floatFromInt" {
             try expect(@as(i32, @floor(f)) == k);
             try expect(@as(i32, @ceil(f)) == k);
             try expect(@as(i32, @trunc(f)) == k);
+            try expect(@as(i32, @trunc(@floor(f))) == k);
         }
     };
     try S.doTheTest();
@@ -197,6 +198,7 @@ test "@floatFromInt(f80)" {
             try expect(@as(Int, @floor(f)) == k);
             try expect(@as(Int, @ceil(f)) == k);
             try expect(@as(Int, @trunc(f)) == k);
+            try expect(@as(Int, @trunc(@floor(f))) == k);
         }
     };
     try S.doTheTest(i31);