diff --git a/Makefile.install b/Makefile.install
index adef0b5f4..87b5bc870 100644
--- a/Makefile.install
+++ b/Makefile.install
@@ -14,6 +14,11 @@ OPENBLAS_CMAKE_CONFIG := OpenBLASConfig.cmake
 OPENBLAS_CMAKE_CONFIG_VERSION := OpenBLASConfigVersion.cmake
 OPENBLAS_PKGCONFIG_DIR := $(OPENBLAS_LIBRARY_DIR)/pkgconfig
 PKG_EXTRALIB := $(EXTRALIB)
+ifeq ($(INTERFACE64),1)
+	SUFFIX64=64
+endif
+PKGFILE="$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE)$(SUFFIX64).pc"
+
 ifeq ($(USE_OPENMP), 1)
   ifeq ($(C_COMPILER), PGI)
           PKG_EXTRALIB += -lomp
@@ -150,14 +155,19 @@ endif
 endif
 
 #Generating openblas.pc
-	@echo Generating $(LIBSONAMEBASE).pc in "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)"
-	@echo 'libdir='$(OPENBLAS_LIBRARY_DIR) > "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE).pc"
-	@echo 'libsuffix='$(SYMBOLSUFFIX) > "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE).pc"
-	@echo 'includedir='$(OPENBLAS_INCLUDE_DIR) >> "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE).pc"
-	@echo 'openblas_config= USE_64BITINT='$(INTERFACE64) 'DYNAMIC_ARCH='$(DYNAMIC_ARCH) 'DYNAMIC_OLDER='$(DYNAMIC_OLDER) 'NO_CBLAS='$(NO_CBLAS) 'NO_LAPACK='$(NO_LAPACK) 'NO_LAPACKE='$(NO_LAPACKE) 'NO_AFFINITY='$(NO_AFFINITY) 'USE_OPENMP='$(USE_OPENMP) $(CORE) 'MAX_THREADS='$(NUM_THREADS)>> "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE).pc"
-	@echo 'version='$(VERSION) >> "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE).pc"
-	@echo 'extralib='$(PKG_EXTRALIB) >> "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE).pc"
-	@cat openblas.pc.in >> "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE).pc"
+ifeq ($(INTERFACE64),1)
+	SUFFIX64=64
+endif
+	PKGFILE="$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE)$(SUFFIX64).pc"
+
+	@echo Generating $(LIBSONAMEBASE)$(SUFFIX64).pc in "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)"
+	@echo 'libdir='$(OPENBLAS_LIBRARY_DIR) > "$(PKGFILE)"
+	@echo 'libsuffix='$(SYMBOLSUFFIX) >> "$(PKGFILE)"
+	@echo 'includedir='$(OPENBLAS_INCLUDE_DIR) >> "$(PKGFILE)"
+	@echo 'openblas_config= USE_64BITINT='$(INTERFACE64) 'DYNAMIC_ARCH='$(DYNAMIC_ARCH) 'DYNAMIC_OLDER='$(DYNAMIC_OLDER) 'NO_CBLAS='$(NO_CBLAS) 'NO_LAPACK='$(NO_LAPACK) 'NO_LAPACKE='$(NO_LAPACKE) 'NO_AFFINITY='$(NO_AFFINITY) 'USE_OPENMP='$(USE_OPENMP) $(CORE) 'MAX_THREADS='$(NUM_THREADS)>> "$(PKGFILE)"
+	@echo 'version='$(VERSION) >> "$(PKGFILE)"
+	@echo 'extralib='$(PKG_EXTRALIB) >> "$(PKGFILE)"
+	@cat openblas.pc.in >> "$(PKGFILE)"
 
 
 #Generating OpenBLASConfig.cmake