diff --git a/configure.ac b/configure.ac
index d14ddf198..bbef41ce8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -743,6 +743,7 @@ dnl Check for OpenMP support
 AX_OPENMP(
   [AC_DEFINE(HAVE_OPENMP, 1, [Define if OpenMP is enabled])
    AM_CONDITIONAL([HAVE_OPENMP], [true])
+   CPPFLAGS="$CPPFLAGS -DMULTICORE"
    CXXFLAGS="$CXXFLAGS $OPENMP_CXXFLAGS"],
   [AC_MSG_WARN([OpenMP not supported, disabling multithreading])
    AC_DEFINE(HAVE_OPENMP, 0, [Define if OpenMP is enabled])
diff --git a/src/Makefile.am b/src/Makefile.am
index 0c866ff02..1346dd4c8 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -525,7 +525,7 @@ libzcash_a_SOURCES = \
   zcash/circuit/prfs.tcc \
   zcash/circuit/utils.tcc
 
-libzcash_a_CPPFLAGS = -DMULTICORE -fopenmp -fPIC -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DBOOST_SPIRIT_THREADSAFE -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS $(HARDENED_CPPFLAGS) $(HARDENED_CXXFLAGS) $(HARDENED_LDFLAGS) -pipe $(SAN_LDFLAGS) -O1 -g -Wstack-protector $(SAN_CXXFLAGS) -fstack-protector-all -fPIE -fvisibility=hidden -DSTATIC $(BITCOIN_INCLUDES)
+libzcash_a_CPPFLAGS = -fPIC -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DBOOST_SPIRIT_THREADSAFE -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS $(HARDENED_CPPFLAGS) $(HARDENED_CXXFLAGS) $(HARDENED_LDFLAGS) -pipe $(SAN_LDFLAGS) -O1 -g -Wstack-protector $(SAN_CXXFLAGS) -fstack-protector-all -fPIE -fvisibility=hidden -DSTATIC $(BITCOIN_INCLUDES)
 
 libzcash_a_CXXFLAGS = $(SAN_CXXFLAGS) $(HARDENED_CXXFLAGS) -fwrapv -fno-strict-aliasing
 
diff --git a/src/Makefile.gtest.include b/src/Makefile.gtest.include
index eaad8a79f..82d654ba4 100644
--- a/src/Makefile.gtest.include
+++ b/src/Makefile.gtest.include
@@ -46,7 +46,7 @@ zcash_gtest_SOURCES += \
 	wallet/gtest/test_wallet.cpp
 endif
 
-zcash_gtest_CPPFLAGS = $(AM_CPPFLAGS) -DMULTICORE -fopenmp -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DSTATIC $(BITCOIN_INCLUDES)
+zcash_gtest_CPPFLAGS = $(AM_CPPFLAGS) -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DSTATIC $(BITCOIN_INCLUDES)
 zcash_gtest_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 
 zcash_gtest_LDADD = -lgtest -lgmock $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index 582ecb577..2ba7eb9ce 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -99,7 +99,7 @@ BITCOIN_TESTS += \
 endif
 
 test_test_bitcoin_SOURCES = $(BITCOIN_TESTS) $(JSON_TEST_FILES) $(RAW_TEST_FILES)
-test_test_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) -fopenmp $(BITCOIN_INCLUDES) -I$(builddir)/test/ $(TESTDEFS) $(EVENT_CFLAGS)
+test_test_bitcoin_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) -I$(builddir)/test/ $(TESTDEFS) $(EVENT_CFLAGS)
 test_test_bitcoin_LDADD = $(LIBBITCOIN_SERVER) $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CRYPTO) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBMEMENV) \
   $(BOOST_LIBS) $(BOOST_UNIT_TEST_FRAMEWORK_LIB) $(LIBSECP256K1) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS)
 test_test_bitcoin_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)