diff --git a/src/data/number_types.jl b/src/data/number_types.jl
index 176c0785..71a80361 100644
--- a/src/data/number_types.jl
+++ b/src/data/number_types.jl
@@ -37,7 +37,7 @@ function jltype(f::JLDFile, dt::FixedPointDatatype)
         elseif dt.size == 1
             return signed ? SameRepr{Int8}() : SameRepr{UInt8}()
         elseif dt.size == 4
-            return signed ? SameRepr{Int32}() : SameRepr{Int32}()
+            return signed ? SameRepr{Int32}() : SameRepr{UInt32}()
         elseif dt.size == 2
             return signed ? SameRepr{Int16}() : SameRepr{UInt16}()
         elseif dt.size == 16
diff --git a/test/loadsave.jl b/test/loadsave.jl
index 5b3decaf..5a3e00f1 100644
--- a/test/loadsave.jl
+++ b/test/loadsave.jl
@@ -847,4 +847,21 @@ end
     loaded_data = load(fn, "data")
     @test !isassigned(loaded_data, 2)
     @test loaded_data[1] == :a
-end
\ No newline at end of file
+end
+
+@testset "Issue #619 - Number type turnaround" begin
+    fn = joinpath(mktempdir(), "number_type_turnaround.jld2")
+    types = [UInt8, Int8, UInt16, Int16, UInt32, Int32, UInt64, Int64, UInt128, Int128, Float16, Float32, Float64]
+    jldopen(fn, "w") do f
+        for t in types
+            f[string(t)] = typemax(t)
+        end
+    end
+    jldopen(fn) do f
+        for t in types
+            v = f[string(t)]
+            @test v isa t
+            @test v == typemax(t)
+        end
+    end
+end