diff --git a/eo/app/gprop/Makefile.am b/eo/app/gprop/Makefile.am
index eb87ebb5..1a251c80 100644
--- a/eo/app/gprop/Makefile.am
+++ b/eo/app/gprop/Makefile.am
@@ -16,7 +16,7 @@ CXXFLAGS = -g
 bin_PROGRAMS = gprop
 ###############################################################################
 
-gprop_SOURCES = gprop.cc
+gprop_SOURCES = gprop.cpp
 gprop_DEPENDENCIES = $(DEPS)
 gprop_LDFLAGS = -lm
 gprop_LDADD = $(LDADDS)
diff --git a/eo/app/gprop/gprop.cc b/eo/app/gprop/gprop.cpp
similarity index 100%
rename from eo/app/gprop/gprop.cc
rename to eo/app/gprop/gprop.cpp