diff --git a/core/SConscript.firmware b/core/SConscript.firmware
index 94f72490ea..21afcf0fe2 100644
--- a/core/SConscript.firmware
+++ b/core/SConscript.firmware
@@ -120,7 +120,7 @@ if FEATURE_FLAGS["SECP256K1_ZKP"]:
     CPPDEFINES_MOD += [
         'USE_SECP256K1_ZKP',
         'USE_SECP256K1_ZKP_ECDSA',
-        ('SECP256K1_CONTEXT_SIZE', '8416'),
+        ('SECP256K1_CONTEXT_SIZE', '184'),
         'USE_ASM_ARM',
         'USE_NUM_NONE',
         'USE_FIELD_INV_BUILTIN',
diff --git a/core/SConscript.unix b/core/SConscript.unix
index df18789458..3601a0e175 100644
--- a/core/SConscript.unix
+++ b/core/SConscript.unix
@@ -118,7 +118,7 @@ if FEATURE_FLAGS["SECP256K1_ZKP"]:
     CPPDEFINES_MOD += [
         'USE_SECP256K1_ZKP',
         'USE_SECP256K1_ZKP_ECDSA',
-        ('SECP256K1_CONTEXT_SIZE', '8416'),
+        ('SECP256K1_CONTEXT_SIZE', '208'),
         'USE_NUM_NONE',
         'USE_FIELD_INV_BUILTIN',
         'USE_SCALAR_INV_BUILTIN',
diff --git a/crypto/Makefile b/crypto/Makefile
index d266fac4b0..e348cfefc2 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -48,7 +48,7 @@ ZKP_CFLAGS = \
 	-DENABLE_MODULE_SCHNORRSIG \
 	-DENABLE_MODULE_EXTRAKEYS
 ZKP_PATH = ../vendor/secp256k1-zkp
-CFLAGS += -DSECP256K1_CONTEXT_SIZE=8416
+CFLAGS += -DSECP256K1_CONTEXT_SIZE=208
 
 VALGRIND ?= 1