diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index c654f08..770c6b5 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -41,7 +41,7 @@
 #include <utils/String8.h>
 #include <utils/Trace.h>
 
-EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
+extern "C" EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
 #define CROP_EXT_STR "EGL_ANDROID_image_crop"
 #define PROT_CONTENT_EXT_STR "EGL_EXT_protected_content"
 #define EGL_PROTECTED_CONTENT_EXT 0x32C0
diff --git a/libs/gui/SyncFeatures.cpp b/libs/gui/SyncFeatures.cpp
index 187b211..afa15c5 100644
--- a/libs/gui/SyncFeatures.cpp
+++ b/libs/gui/SyncFeatures.cpp
@@ -27,7 +27,7 @@
 
 #include <private/gui/SyncFeatures.h>
 
-EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
+extern "C" EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
 
 namespace android {
 
diff --git a/libs/gui/tests/SurfaceTextureClient_test.cpp b/libs/gui/tests/SurfaceTextureClient_test.cpp
index bd598e4..d5b2f00 100644
--- a/libs/gui/tests/SurfaceTextureClient_test.cpp
+++ b/libs/gui/tests/SurfaceTextureClient_test.cpp
@@ -28,7 +28,7 @@
 #include <utils/Log.h>
 #include <utils/Thread.h>
 
-EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
+extern "C" EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);
 #define CROP_EXT_STR "EGL_ANDROID_image_crop"
 
 namespace android {