diff --git a/api/Makefile.am b/api/Makefile.am
index d8c1e54..46ead13 100644
--- a/api/Makefile.am
+++ b/api/Makefile.am
@@ -42,7 +42,7 @@ libtesseract_api_la_CPPFLAGS = $(AM_CPPFLAGS)
 if VISIBILITY
 libtesseract_api_la_CPPFLAGS += -DTESS_EXPORTS
 endif
-libtesseract_api_la_SOURCES = baseapi.cpp capi.cpp renderer.cpp pdfrenderer.cpp
+libtesseract_api_la_SOURCES = baseapi.cpp capi.cpp renderer.cpp pdfrenderer.cpp tesscapi.cpp
 
 lib_LTLIBRARIES += libtesseract.la
 libtesseract_la_LDFLAGS =