diff --git a/_float-features.lisp b/float-features.lisp
index b377c0d..6d56968 100644
--- a/_float-features.lisp
+++ b/float-features.lisp
@@ -334,6 +334,8 @@
   (ext:single-float-to-bits float)
   #+cmucl
   (ldb (byte 32 0) (kernel:single-float-bits float))
+  #+ecl
+  (si:single-float-bits float)
   #+lispworks
   (let ((v (sys:make-typed-aref-vector 4)))
     (declare (optimize (speed 3) (float 0) (safety 0)))
@@ -344,7 +346,7 @@
   (mezzano.extensions:single-float-to-ieee-binary32 float)
   #+sbcl
   (ldb (byte 32 0) (sb-kernel:single-float-bits float))
-  #-(or abcl allegro ccl clasp cmucl lispworks mezzano sbcl)
+  #-(or abcl allegro ccl clasp cmucl ecl lispworks mezzano sbcl)
   (progn float (error "Implementation not supported.")))
 
 (declaim (ftype (function (T) (unsigned-byte 64)) double-float-bits))
@@ -364,6 +366,8 @@
   (ldb (byte 64 0)
    (logior (kernel:double-float-low-bits float)
            (ash (kernel:double-float-high-bits float) 32)))
+  #+ecl
+  (si:double-float-bits float)
   #+lispworks
   (let ((v (sys:make-typed-aref-vector 8)))
     (declare (optimize (speed 3) (float 0) (safety 0)))
@@ -378,7 +382,7 @@
   (ldb (byte 64 0)
        (logior (sb-kernel:double-float-low-bits float)
                (ash (sb-kernel:double-float-high-bits float) 32)))
-  #-(or abcl allegro ccl clasp cmucl lispworks mezzano sbcl)
+  #-(or abcl allegro ccl clasp cmucl ecl lispworks mezzano sbcl)
   (progn float (error "Implementation not supported.")))
 
 (declaim (ftype (function (T) (unsigned-byte 128)) long-float-bits))
@@ -447,6 +451,8 @@
   (flet ((s32 (x)
            (logior x (- (mask-field (byte 1 31) x))) ))
     (kernel:make-single-float (s32 bits)))
+  #+ecl
+  (si:bits-single-float bits)
   #+lispworks
   (let ((v (sys:make-typed-aref-vector 4)))
     (declare (optimize speed (float 0) (safety 0)))
@@ -458,7 +464,7 @@
   #+sbcl
   (sb-kernel:make-single-float
    (sb-c::mask-signed-field 32 (the (unsigned-byte 32) bits)))
-  #-(or abcl allegro ccl clasp cmucl lispworks mezzano sbcl)
+  #-(or abcl allegro ccl clasp cmucl ecl lispworks mezzano sbcl)
   (progn bits (error "Implementation not supported.")))
 
 (declaim (ftype (function (T) double-float) bits-double-float))
@@ -477,6 +483,8 @@
            (logior x (- (mask-field (byte 1 31) x))) ))
     (kernel:make-double-float (s32 (ldb (byte 32 32) bits))
                               (ldb (byte 32 0) bits)))
+  #+ecl
+  (si:bits-double-float bits)
   #+lispworks
   (let ((v (sys:make-typed-aref-vector 8)))
     (declare (optimize speed (float 0) (safety 0)))
@@ -491,7 +499,7 @@
   (sb-kernel:make-double-float
    (sb-c::mask-signed-field 32 (ldb (byte 32 32) (the (unsigned-byte 64) bits)))
    (ldb (byte 32 0) bits))
-  #-(or abcl allegro ccl clasp cmucl lispworks mezzano sbcl)
+  #-(or abcl allegro ccl clasp cmucl ecl lispworks mezzano sbcl)
   (progn bits (error "Implementation not supported.")))
 
 (declaim (ftype (function (T) long-float) bits-long-float))