diff --git a/perl/xs-src/unpack.c b/perl/xs-src/unpack.c
index a4929c0..20b345f 100644
--- a/perl/xs-src/unpack.c
+++ b/perl/xs-src/unpack.c
@@ -113,28 +113,18 @@ STATIC_INLINE int template_callback_IV(unpack_user* u PERL_UNUSED_DECL, IV const
 static int template_callback_uint64(unpack_user* u PERL_UNUSED_DECL, uint64_t const d, SV** o)
 {
     dTHX;
-    if((uint64_t)(NV)d == d) {
-        *o = newSVnv((NV)d);
-    }
-    else {
-        char tbuf[64];
-        STRLEN const len = my_snprintf(tbuf, sizeof(tbuf), "%llu", d);
-        *o = newSVpvn(tbuf, len);
-    }
+    char tbuf[64];
+    STRLEN const len = my_snprintf(tbuf, sizeof(tbuf), "%llu", d);
+    *o = newSVpvn(tbuf, len);
     return 0;
 }
 
 static int template_callback_int64(unpack_user* u PERL_UNUSED_DECL, int64_t const d, SV** o)
 {
     dTHX;
-    if((uint64_t)(NV)d == (uint64_t)d) {
-        *o = newSVnv((NV)d);
-    }
-    else {
-        char tbuf[64];
-        STRLEN const len = my_snprintf(tbuf, sizeof(tbuf), "%lld", d);
-        *o = newSVpvn(tbuf, len);
-    }
+    char tbuf[64];
+    STRLEN const len = my_snprintf(tbuf, sizeof(tbuf), "%lld", d);
+    *o = newSVpvn(tbuf, len);
     return 0;
 }