diff --git a/.gitignore b/.gitignore
index 48ea0f1..265e595 100644
--- a/.gitignore
+++ b/.gitignore
@@ -79,7 +79,7 @@ po/remove-potcdate.sed
 po/stamp-po
 src/psl2c
 src/suffixes.c
-src/suffixes_dafsa.c
+src/suffixes_dafsa.h
 stamp-h1
 test-driver
 tests/*.log
diff --git a/msvc/build-rules-msvc.mak b/msvc/build-rules-msvc.mak
index 78923b7..c0263ab 100644
--- a/msvc/build-rules-msvc.mak
+++ b/msvc/build-rules-msvc.mak
@@ -24,8 +24,8 @@ $<
 $<
 <<
 
-# Make sure we generate suffixes_dafsa.c before trying to compile psl.c
-$(CFG)\$(PLAT)\libpsl\psl.obj: $(CFG)\$(PLAT)\libpsl\suffixes_dafsa.c
+# Make sure we generate suffixes_dafsa.h before trying to compile psl.c
+$(CFG)\$(PLAT)\libpsl\psl.obj: $(CFG)\$(PLAT)\libpsl\suffixes_dafsa.h
 
 # Inference rules for building the test programs
 # Used for programs with a single source file.
@@ -104,7 +104,7 @@ clean:
 	@-del /f /q $(CFG)\$(PLAT)\*.ilk
 	@-if exist $(CFG)\$(PLAT)\tests del /f /q $(CFG)\$(PLAT)\tests\*.obj
 	@-del /f /q $(CFG)\$(PLAT)\libpsl\*.obj
-	@-del /f /q $(CFG)\$(PLAT)\libpsl\suffixes_dafsa.c
+	@-del /f /q $(CFG)\$(PLAT)\libpsl\suffixes_dafsa.h
 	@-del /f /q ..\config.h
 	@-del /f /q vc$(PDBVER)0.pdb
 	@-rmdir /s /q $(CFG)\$(PLAT)
diff --git a/msvc/generate-msvc.mak b/msvc/generate-msvc.mak
index 2fd7697..a778fa8 100644
--- a/msvc/generate-msvc.mak
+++ b/msvc/generate-msvc.mak
@@ -9,7 +9,7 @@ $(CFG)\$(PLAT)\psl	\
 $(CFG)\$(PLAT)\tests:
 	@-md $@
 
-$(CFG)\$(PLAT)\libpsl\suffixes_dafsa.c: $(CFG)\$(PLAT)\libpsl $(PSL_FILE) ..\src\psl-make-dafsa
+$(CFG)\$(PLAT)\libpsl\suffixes_dafsa.h: $(CFG)\$(PLAT)\libpsl $(PSL_FILE) ..\src\psl-make-dafsa
 	@echo Generating $@
 	$(PYTHON) ..\src\psl-make-dafsa --output-format=cxx+ "$(PSL_FILE_INPUT)" $@
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 5b5e765..f9c0a3d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,10 +1,10 @@
 include libpsl-srcs.mk
 
 # suffixes.c must be created before psl.c is compiled
-BUILT_SOURCES = suffixes_dafsa.c
+BUILT_SOURCES = suffixes_dafsa.h
 
 # suffixes.c is a built source that must be cleaned
-CLEANFILES = suffixes_dafsa.c
+CLEANFILES = suffixes_dafsa.h
 
 lib_LTLIBRARIES = libpsl.la
 
@@ -18,8 +18,8 @@ libpsl_la_LDFLAGS = -no-undefined -version-info $(LIBPSL_SO_VERSION)
 
 # Build rule for suffix_dafsa.c
 # PSL_FILE can be set by ./configure --with-psl-file=[PATH]
-suffixes_dafsa.c: $(PSL_FILE) $(srcdir)/psl-make-dafsa
-	$(srcdir)/psl-make-dafsa --output-format=cxx+ "$(PSL_FILE)" suffixes_dafsa.c
+suffixes_dafsa.h: $(PSL_FILE) $(srcdir)/psl-make-dafsa
+	$(srcdir)/psl-make-dafsa --output-format=cxx+ "$(PSL_FILE)" suffixes_dafsa.h
 
 EXTRA_DIST = psl-make-dafsa LICENSE.chromium
 
diff --git a/src/psl.c b/src/psl.c
index 246ac2e..1665293 100644
--- a/src/psl.c
+++ b/src/psl.c
@@ -159,7 +159,7 @@ struct psl_ctx_st {
 
 /* include the PSL data generated by psl-make-dafsa */
 #if defined(BUILTIN_GENERATOR_LIBICU) || defined(BUILTIN_GENERATOR_LIBIDN2) || defined(BUILTIN_GENERATOR_LIBIDN)
-#include "suffixes_dafsa.c"
+#include "suffixes_dafsa.h"
 #else
 static const unsigned char kDafsa[] = "";
 static time_t _psl_file_time = 0;