diff --git a/include/Makefile.am b/include/Makefile.am
index 04f7838..bd30496 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,11 +1,11 @@
 %.h: ${MYLIB}/%.tex
-	${top_srcdir}/tcode $< $@
+	${top_builddir}/tcode $< $@
 
 %.h: ${PROBDIST}/%.tex
-	${top_srcdir}/tcode $< $@
+	${top_builddir}/tcode $< $@
 
 %.h: ${TESTU01}/%.tex
-	${top_srcdir}/tcode $< $@
+	${top_builddir}/tcode $< $@
 
 include Makefile.def
 
diff --git a/include/Makefile.in b/include/Makefile.in
index db818dd..f2e19f6 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -472,13 +472,14 @@ uninstall-am: uninstall-includeHEADERS
 	ps ps-am tags uninstall uninstall-am uninstall-includeHEADERS
 
 %.h: ${MYLIB}/%.tex
-	${top_srcdir}/tcode $< $@
+	${top_builddir}/tcode $< $@
 
 %.h: ${PROBDIST}/%.tex
-	${top_srcdir}/tcode $< $@
+	${top_builddir}/tcode $< $@
 
 %.h: ${TESTU01}/%.tex
-	${top_srcdir}/tcode $< $@
+	${top_builddir}/tcode $< $@
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT: