diff --git a/Makefile b/Makefile
index 86df4644f8b84d3324404e417294ca5b0b7f4249..6b59ffcbe93616a694c5181aa43c3daeb2934ba6 100644
--- a/Makefile
+++ b/Makefile
@@ -253,7 +253,7 @@ ROCKSDB_PLUGIN_PKGCONFIG_REQUIRES = $(foreach plugin, $(ROCKSDB_PLUGINS), $($(pl
 PLATFORM_LDFLAGS += $(foreach plugin, $(ROCKSDB_PLUGINS), $($(plugin)_LDFLAGS))
 CXXFLAGS += $(foreach plugin, $(ROCKSDB_PLUGINS), $($(plugin)_CXXFLAGS))
 
-ifneq ($(ROCKSDB_PLUGIN_PKGCONFIG_REQUIRES),)
+ifneq ($(strip $(ROCKSDB_PLUGIN_PKGCONFIG_REQUIRES)),)
 LDFLAGS := $(LDFLAGS) $(shell pkg-config --libs $(ROCKSDB_PLUGIN_PKGCONFIG_REQUIRES))
 ifneq ($(.SHELLSTATUS),0)
 $(error pkg-config failed)