diff --git a/package/librtlsdr/librtlsdr.mk b/package/librtlsdr/librtlsdr.mk
index 2c5cf1ffce..51ecabe14a 100644
--- a/package/librtlsdr/librtlsdr.mk
+++ b/package/librtlsdr/librtlsdr.mk
@@ -19,4 +19,15 @@ ifeq ($(BR2_PACKAGE_LIBRTLSDR_DETACH_DRIVER),y)
 LIBRTLSDR_CONF_OPTS += -DDETACH_KERNEL_DRIVER=1
 endif
 
+# In case of static-lib-only builds, CMake's FindThreads.cmake code tries to
+# get the right flags, checking first for -lpthreads, then -lpthread, and lastly
+# for -pthread.
+# The 2 first link checks fail because of undefined symbols: __libc_setup_tls.
+# In the later check, CMake successfully compiles and links the test program,
+# but it also tries to run it, which is wrong when cross-compiling.
+#
+# The following CMake variable only disables the TRY_RUN call in the -pthread
+# test.
+LIBRTLSDR_CONF_OPTS += -DTHREADS_PTHREAD_ARG=OFF
+
 $(eval $(cmake-package))