diff --git a/gb.pdf/src/Makefile.am b/gb.pdf/src/Makefile.am
index 418dbec86..f23192a43 100644
--- a/gb.pdf/src/Makefile.am
+++ b/gb.pdf/src/Makefile.am
@@ -5,6 +5,7 @@ gblib_LTLIBRARIES = gb.pdf.la
 
 gb_pdf_la_LIBADD = @POPPLER_LIB@
 gb_pdf_la_LDFLAGS = -module @LD_FLAGS@ @POPPLER_LDFLAGS@
+gb_pdf_la_CXXFLAGS = $(AM_CXXFLAGS) -std=c++11
 gb_pdf_la_CPPFLAGS = @POPPLER_INC@
 
 gb_pdf_la_SOURCES = main.h main.cpp \