diff --git a/src/ocrmypdf/leptonica.py b/src/ocrmypdf/leptonica.py
index 1cdec312..ef2a2b82 100644
--- a/src/ocrmypdf/leptonica.py
+++ b/src/ocrmypdf/leptonica.py
@@ -39,7 +39,11 @@ from .lib._leptonica import ffi
 
 logger = logging.getLogger(__name__)
 
-lept = ffi.dlopen(find_library('lept'))
+if os.name == 'nt':
+    libname = 'liblept-5'
+else:
+    libname = 'lept'
+lept = ffi.dlopen(find_library(libname))
 lept.setMsgSeverity(lept.L_SEVERITY_WARNING)